Reuters/Ipsos poll: A waste of money? Trump's border wall falling flat in Arizona

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NEW YORK, Oct 23 (Reuters) - Donald Trump rode to the top of the Republican ticket promising a "big, beautiful, powerful" border wall with Mexico to stop the flow of undocumented immigrants. Along that border, however, Americans are more likely to call the wall a "waste of money," according to a Reuters/Ipsos opinion poll.

The results show that while the New York businessman may have expected his tough stance on immigration to fire up support nationally, it seems to be falling short in a state heavily affected by illegal immigration, and where he is now facing a surprising challenge from his Democratic rival Hillary Clinton.

SEE ALSO: Ben Carson breaks with Trump on refusal to accept outcome of the election

Asked if a wall would be "an effective barrier or a waste of money," 47 percent of Arizona residents picked "waste of money" and 34 percent picked "effective barrier," with the rest picking neither, according to the poll. Among Republicans, 21 percent picked "waste of money" and 57 percent picked "effective barrier."

See Trump and Clinton at a recent event:

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Clinton and Trump at the Alfred E. Smith Foundation Dinner
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Clinton and Trump at the Alfred E. Smith Foundation Dinner
From left Democratic presidential nominee Hillary Clinton, Timothy Cardinal Dolan, Archbishop of New York, and Republican presidential nominee Donald Trump laugh during the Alfred E. Smith Memorial Foundation Dinner at Waldorf Astoria October 20, 2016 in New York, New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
From left Democratic presidential nominee Hillary Clinton, Timothy Cardinal Dolan, Archbishop of New York, and Republican presidential nominee Donald Trump laugh during the Alfred E. Smith Memorial Foundation Dinner at Waldorf Astoria October 20, 2016 in New York, New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Democratic presidential nominee Hillary Clinton (L) and Republican presidential nominee Donald Trump shake hands after speaking during the Alfred E. Smith Memorial Foundation Dinner at Waldorf Astoria October 20, 2016 in New York, New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
From left Timothy Cardinal Dolan, Archbishop of New York, Republican presidential nominee Donald Trump, Melania Trump and others listen as Democratic presidential nominee Hillary Clinton speaks during the Alfred E. Smith Memorial Foundation Dinner at Waldorf Astoria October 20, 2016 in New York, New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Republican presidential nominee Donald Trump and others listen as Democratic presidential nominee Hillary Clinton speaks during the Alfred E. Smith Memorial Foundation Dinner at Waldorf Astoria October 20, 2016 in New York, New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Democratic presidential nominee Hillary Clinton (R) and others listen as Republican presidential nominee Donald Trump speaks during the Alfred E. Smith Memorial Foundation Dinner at Waldorf Astoria October 20, 2016 in New York, New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Democratic presidential nominee Hillary Clinton (L) and Republican presidential nominee Donald Trump (R) wait with Timothy Cardinal Dolan, Archbishop of New York, before speaking during the Alfred E. Smith Memorial Foundation Dinner at Waldorf Astoria October 20, 2016 in New York, New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Democratic presidential nominee Hillary Clinton (2nd L) and Archbishop of New York Timothy Cardinal Dolan (L) chat watched by Republican presidential nominee Donald Trump and his wife Melania Trump during the 71st annual Alfred E. Smith Memorial Foundation Dinner at the Waldorf-Astoria Hotel in New York on October 20, 2016. / AFP / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
Republican presidential nominee Donald Trump pats Democratic presidential nominee Hillary Clinton on the back as she speaks with Timothy Cardinal Dolan, Archbishop of New York, during the Alfred E. Smith Memorial Foundation Dinner at Waldorf Astoria October 20, 2016 in New York, New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Democratic presidential nominee Hillary Clinton and Republican presidential nominee Donald Trump greet attendees after the Alfred E. Smith Memorial Foundation Dinner at Waldorf Astoria October 20, 2016 in New York, New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Democratic presidential nominee Hillary Clinton laughs as Republican presidential nominee Donald Trump speaks during the 71st annual Alfred E. Smith Memorial Foundation Dinner at the Waldorf-Astoria Hotel in New York on October 20, 2016. / AFP / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
NEW YORK, NY - OCTOBER 20: In this handout provided by the Archdiocese of New York, Cardinal Timothy Dolan poses with Republican presidential candidate Donald Trump and Democratic candidate Hillary Clinton the annual Alfred E. Smith Memorial Foundation Dinner at the Waldorf Astoria October 20, 2016 in New York City. The dinner has been attended by presidential candidates since 1960 and gives the candidates an opportunity to poke fun at themselves and each other. (Photo by Daniel Goodrich/Archdiocese of New York via Getty Images)
NEW YORK, NY - OCTOBER 20: Cardinal Timothy Dolan sits between and his wife Melania Trump, Donald Trump attends the annual Alfred E. Smith Memorial Foundation Dinner at the Waldorf Astoria on October 20, 2016 in New York City.The white-tie dinner, which benefits Catholic charities and celebrates former Governor of New York Al Smith, has been attended by presidential candidates since 1960 and gives the candidates an opportunity to poke fun at themselves and each other. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - OCTOBER 20: Hillary Clinton speaks with Melania Trump while attending the annual Alfred E. Smith Memorial Foundation Dinner at the Waldorf Astoria on October 20, 2016 in New York City.The white-tie dinner, which benefits Catholic charities and celebrates former Governor of New York Al Smith, has been attended by presidential candidates since 1960 and gives the candidates an opportunity to poke fun at themselves and each other. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - OCTOBER 20: Donald Trump walks onto the stage while attending the annual Alfred E. Smith Memorial Foundation Dinner at the Waldorf Astoria on October 20, 2016 in New York City.The white-tie dinner, which benefits Catholic charities and celebrates former Governor of New York Al Smith, has been attended by presidential candidates since 1960 and gives the candidates an opportunity to poke fun at themselves and each other. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - OCTOBER 20: Hillary Clinton walks by Melania Trump while attending the annual Alfred E. Smith Memorial Foundation Dinner at the Waldorf Astoria on October 20, 2016 in New York City.The white-tie dinner, which benefits Catholic charities and celebrates former Governor of New York Al Smith, has been attended by presidential candidates since 1960 and gives the candidates an opportunity to poke fun at themselves and each other. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - OCTOBER 20: Donald Trump walks onto the stage while attending the annual Alfred E. Smith Memorial Foundation Dinner at the Waldorf Astoria on October 20, 2016 in New York City.The white-tie dinner, which benefits Catholic charities and celebrates former Governor of New York Al Smith, has been attended by presidential candidates since 1960 and gives the candidates an opportunity to poke fun at themselves and each other. (Photo by Spencer Platt/Getty Images)
Democratic presidential nominee Hillary Clinton, Timothy Cardinal Dolan, Archbishop of New York, Republican presidential nominee Donald Trump, Melania Trump and others listen to an invocation during the Alfred E. Smith Memorial Foundation Dinner at Waldorf Astoria October 20, 2016 in New York, New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Democratic presidential nominee Hillary Clinton, Timothy Cardinal Dolan, Archbishop of New York, Republican presidential nominee Donald Trump, Melania Trump and others listen to an invocation during the Alfred E. Smith Memorial Foundation Dinner at Waldorf Astoria October 20, 2016 in New York, New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
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Most Arizonans also believed it is not realistic to expect Mexico to pay for the wall, something Trump has vowed would happen if he's elected president on Nov. 8, according to the poll.

The results lined up closely with nationwide opinions of Trump's immigration policy: 49 percent of American adults say the wall would be a "waste of money" and 31 percent say it would be an "effective barrier."

"As big and powerful, as rich as this nation is, we cannot just leave the door open," said Tony Estrada, Santa Cruz County Sheriff, who has served in law enforcement in the border county for 49 years. "But, we need a realistic and humane process. Donald Trump is  catering to people's fear."

Hear Donald Trump and Hillary Clinton weigh in on immigration:

Polls show Arizona, a state that has voted Democrat only once in a presidential election since 1952, has become competitive. The Real Clear Politics average of polls showed Clinton ahead there by 1.3 percentage points. Reuters/Ipsos polling shows Trump ahead there by 4 points.

Clinton's campaign said last week it would spend $2 million more campaigning in Arizona before the election.

See Trump and Clinton at the final debate:

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Clinton and Trump face off in the final presidential debate
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Clinton and Trump face off in the final presidential debate
Democratic presidential nominee Hillary Clinton speaks during the third and final US presidential debate with Republican nominee Donald Trump at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
Republican presidential nominee Donald Trump is seen on screens speaking during the final presidential debate with Democratic presidential nominee Hillary Clinton at the University of Nevada October 19, 2016 in Las Vegas, Nevada. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Republican U.S. presidential nominee Donald Trump and Democratic nominee Hillary Clinton begin their third and final 2016 presidential campaign debate at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Mike Blake
Republican nominee Donald Trump speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
Democratic presidential nominee Hillary Clinton debates with Republican presidential nominee Donald Trump during the third presidential debate at UNLV in Las Vegas, Wednesday, Oct. 19, 2016. (Mark Ralston/Pool via AP)
US Republican presidential candidate Donald Trump speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Democratic nominee Hillary Clinton speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)
Republican presidential nominee Donald Trump during the third presidential debate with Democratic presidential nominee Hillary Clinton at UNLV in Las Vegas, Wednesday, Oct. 19, 2016. (AP Photo/David Goldman)
Republican nominee Donald Trump speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)
Democratic presidential nominee Hillary Clinton speaks during the third presidential debate with Republican presidential nominee Donald Trump at UNLV in Las Vegas, Wednesday, Oct. 19, 2016. (AP Photo/Patrick Semansky)
Republican presidential nominee Donald Trump and Democratic presidential nominee Hillary Clinton wait to begin their final debate at the University of Nevada October 19, 2016 in Las Vegas, Nevada. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Meg Whitman (C), Hewlett-Packard president and chief executive officer, and retired basketball player Kareem Abdul-Jabbar (2nd R) attend the third and final presidential debate between Republican presidential nominee Donald Trump and Democratic contender Hillary Clinton at the University of Nevada in Las Vegas on October 19, 2016. / AFP / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
US Democratic presidential candidate Hillary Clinton speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Republican presidential nominee Donald Trump points toward Democratic presidential nominee Hillary Clinton as he answers a question during the third presidential debate at UNLV in Las Vegas, Wednesday, Oct. 19, 2016. (AP Photo/John Locher)
Democratic nominee Hillary Clinton speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)
Democratic presidential nominee Hillary Clinton exchanges views Republican presidential nominee Donald Trump during the third presidential debate at UNLV in Las Vegas, Wednesday, Oct. 19, 2016. (AP Photo/John Locher)
Democratic presidential nominee Hillary Clinton listens to Republican presidential nominee Donald Trump during the third presidential debate at UNLV in Las Vegas, Wednesday, Oct. 19, 2016. (AP Photo/Patrick Semansky)
US Republican presidential candidate Donald Trump speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Democratic presidential nominee Hillary Clinton answers a question during the third presidential debate at UNLV in Las Vegas, Wednesday, Oct. 19, 2016. (AP Photo/John Locher)
Republican presidential nominee Donald Trump speaks during the third presidential debate with Democratic presidential nominee Hillary Clinton at UNLV in Las Vegas, Wednesday, Oct. 19, 2016. (AP Photo/David Goldman)
Republican presidential nominee Donald Trump listens to Democratic presidential nominee Hillary Clinton during the third presidential debate at UNLV in Las Vegas, Wednesday, Oct. 19, 2016. (AP Photo/David Goldman)
Democratic presidential nominee Hillary Clinton speaks during the third presidential debate with Republican presidential nominee Donald Trump at UNLV in Las Vegas, Wednesday, Oct. 19, 2016. (AP Photo/Patrick Semansky)
Republican U.S. presidential nominee Donald Trump speaks during the third and final debate with Democratic nominee Hillary Clinton (not pictured) at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Carlos Barria
Debate moderator Chris Wallace smiles back at the audiencee before Republican U.S. presidential nominee Donald Trump and Democratic nominee Hillary Clinton's third and final 2016 presidential campaign debate at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Carlos Barria
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton keep their distance and do not shake hands at the start of the their third and final 2016 presidential campaign debate at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Joe Raedle/Pool
Democratic nominee Hillary Clinton speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)
Democratic nominee Hillary Clinton speaks as Republican nominee Donald Trump looks on during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
US Republican presidential candidate Donald Trump (L) and US Democratic presidential candidate Hillary Clinton arrive for the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Democratic nominee Hillary Clinton (R) and Republican nominee Donald Trump arrive for the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
US Republican presidential candidate Donald Trump speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Democratic presidential nominee Hillary Clinton steps on stage to debate Republican presidential nominee Donald Trump during the third presidential debate at UNLV in Las Vegas, Wednesday, Oct. 19, 2016. (AP Photo/John Locher)
Republican U.S. presidential nominee Donald Trump listens as Democratic U.S. presidential nominee Hillary Clinton speaks during their third and final 2016 presidential campaign debate at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/David Becker
Republican U.S. presidential nominee Donald Trump adjusts his microphone while he listens as Democratic nominee Hillary Clinton speaks during their third and final 2016 presidential campaign debate at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Rick Wilking
Donald Trump Jr. sits between his wife Vanessa (L) and his brother Eric Trump (R) during the third and final debate between Republican U.S. presidential nominee Donald Trump and Democratic nominee Hillary Clinton at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Rick Wilking
Republican U.S. presidential nominee Donald Trump speaks during the third and final debate with Democratic nominee Hillary Clinton (not pictured) at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Carlos Barria
Democratic U.S. presidential nominee Hillary Clinton walks onstage for the third and final 2016 presidential campaign debate with Republican U.S. presidential nominee Donald Trump at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Lucy Nicholson
US Republican presidential candidate Donald Trump speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Democratic nominee Hillary Clinton speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)
Republican presidential nominee Donald Trump and Democratic presidential nominee Hillary Clinton arrive on stage for their final debate at the University of Nevada October 19, 2016 in Las Vegas, Nevada. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Republican presidential nominee Donald Trump arrives on stage for the third and final presidential debate at the University of Nevada in Las Vegas on October 19, 2016. / AFP / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
US Republican presidential candidate Donald Trump speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Republican nominee Donald Trump speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)
US Republican presidential candidate Donald Trump speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
US Republican presidential candidate Donald Trump speaks during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton keep their distance and do not shake hands at the start of the their third and final 2016 presidential campaign debate at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Joe Raedle/Pool
Chelsea Clinton, her father former U.S. president Bill Clinton, and her husband Marc Mezvinsky arrive before Republican U.S. presidential nominee Donald Trump and Democratic nominee Hillary Clinton's third and final 2016 presidential campaign debate at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Carlos Barria
Melania Trump arrives for the third and final debate between Republican U.S. presidential nominee Donald Trump and Democratic nominee Hillary Clinton at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Carlos Barria
Ivanka Trump takes her seat before the third and final 2016 presidential campaign debate between Republican U.S. presidential nominee Donald Trump and Democratic nominee Hillary Clinton at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Mike Blake
Melania Trump (R) greets vice presidential candidate Mike Pence before the third and final 2016 presidential campaign debate between Republican U.S. presidential nominee Donald Trump and Democratic nominee Hillary Clinton at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Mike Blake
Debate moderator Chris Wallace speaks prior to the third and final US presidential debate between Democratic nominee Hillary Clinton and Republican nominee Donald Trump at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
Eric Trump takes his seat before the third and final 2016 presidential campaign debate between Republican U.S. presidential nominee Donald Trump and Democratic nominee Hillary Clinton at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Mike Blake
Fox News modeator Chris Wallace speaks before the third and final 2016 presidential campaign debate between Republican U.S. presidential nominee Donald Trump and Democratic nominee Hillary Clinton at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Mike Blake
Actor Ted Danson and his wife actress Mary Steenburgen sit before Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton's third and final 2016 presidential campaign debate at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Mark Ralston/Pool
Democratic nominee Hillary Clinton arrives for the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)
Republican nominee Donald Trump gestures as Democratic nominee Hillary Clinton looks on during the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
Democratic nominee Hillary Clinton (R) and Republican nominee Donald Trump walk off the stage after the final presidential debate at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)
People watch the third presidential debate between presidential debate between US Democratic presidential candidate Hillary Clinton and US Republican presidential candidate Donald Trump at the Trump International Hotel October 19, 2016 in Washington, D.C. / AFP / ZACH GIBSON (Photo credit should read ZACH GIBSON/AFP/Getty Images)
People watch the third presidential debate between US Democratic presidential candidate Hillary Clinton and US Republican presidential candidate Donald Trump is pictured at The Hawk 'n' Dove bar October 19, 2016 in Washington, D.C. / AFP / ZACH GIBSON (Photo credit should read ZACH GIBSON/AFP/Getty Images)
Democratic presidential nominee Hillary Clinton waves from the stage following the third and final US presidential debate with Republican nominee Donald Trump (background) at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
LAS VEGAS, NV - OCTOBER 19: Democratic presidential nominee former Secretary of State Hillary Clinton walks off stage as Republican presidential nominee Donald Trump looks on during the third U.S. presidential debate at the Thomas & Mack Center on October 19, 2016 in Las Vegas, Nevada. Tonight is the final debate ahead of Election Day on November 8. (Photo by Drew Angerer/Getty Images)
Democratic presidential nominee Hillary Clinton departs the stage following the third and final US presidential debate with Republican nominee Donald Trump at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on October 19, 2016. / AFP / Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
LAS VEGAS, NV - OCTOBER 19: Democratic presidential nominee former Secretary of State Hillary Clinton (R) debates with Republican presidential nominee Donald Trump during the third U.S. presidential debate at the Thomas & Mack Center on October 19, 2016 in Las Vegas, Nevada. Tonight is the final debate ahead of Election Day on November 8. (Photo by Joe Raedle/Getty Images)
LAS VEGAS, NV - OCTOBER 19: Republican presidential nominee Donald Trump gestures as he speaks during the third U.S. presidential debate at the Thomas & Mack Center on October 19, 2016 in Las Vegas, Nevada. Tonight is the final debate ahead of Election Day on November 8. (Photo by Win McNamee/Getty Images)
LAS VEGAS, NV - OCTOBER 19: Democratic presidential nominee former Secretary of State Hillary Clinton gestures to the crowd as she walks off stage as Republican presidential nominee Donald Trump smiles after the third U.S. presidential debate at the Thomas & Mack Center on October 19, 2016 in Las Vegas, Nevada. Tonight is the final debate ahead of Election Day on November 8. (Photo by Chip Somodevilla/Getty Images)
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DRIVING LATINOS TO THE POLLS

Arizona's border with Mexico is 370 miles long, covering an isolated desert terrain that has drawn millions seeking to cross illegally. The state's number of undocumented immigrants has fallen 35 percent from a 2007 peak to 325,000, according to the Pew Research Center, as Arizona cracked down on that population. Nationwide, the number has dropped 9 percent from a high in 2007 to 11.1 million undocumented immigrants.

Wendy Cornacchio, a 45 year-old Trump supporter from Phoenix, said she believes illegal immigration is still a problem - but she would rather see technologies like drone surveillance than Trump's wall to address it. "I don't think that necessarily building a wall will work, but the concept of closing the borders I agree with," she said.

Florida is another closely-fought state that has seen large levels of illegal immigration, though by sea rather than by land. Some 41 percent of voters there said they believed Trump's wall would be a "waste of money," while 36 percent thought it would be an "effective barrier."

Progressive activist groups in both Florida and Arizona have been using Trump's hard line on immigration against him to mobilize Latinos for Clinton, who advocates a path to citizenship for some undocumented immigrants. Mi Familia Vota, for example, says they registered more than 15,000 people in Arizona this year.

The Reuters/Ipsos poll was conducted online in English and Spanish in Arizona and Florida. The Arizona poll ran from Oct. 5 to Oct. 19 and gathered responses from 2,600 people. The Florida poll ran from Oct. 5 to Oct. 12 and gathered responses from 2,610 people. Both polls have a credibility interval, a measure of accuracy, of 2 percentage points for the total group and 3 percentage points for likely voters.

Related: Also see GOP leaders who refuse to back Trump:

36 PHOTOS
Republicans coming out against Donald Trump
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Republicans coming out against Donald Trump

Arizona Senator John McCain: "I will not vote for Donald Trump."

(Photo by Patrick T. Fallon/Bloomberg via Getty Images)

2012 presidential nominee Mitt Romney: Trump's "vile degradations ... corrupt America's face to the world."

(AP Photo/Rick Bowmer, File)

New Hampshire Senator Kelly Ayotte: "I will not be voting for Donald Trump."

(AP Photo/Pablo Martinez Monsivais)

Former Florida Governor Jeb Bush: "No apology can excuse away Donald Trump's reprehensible comments degrading women."

(Photo by Paul Marotta/Getty Images)

Texas Senator Ted Cruz: Trump's comments are "disturbing and inappropriate, there is simply no excuse for them."

(Photo by Chip Somodevilla/Getty Images)

South Carolina Senator Lindsey Graham: "I have never been comfortable with Donald Trump as our Republican nominee."

(Photo by Riccardo Savi/Getty Images for Concordia Summit)

Former Secretary of State Condoleezza Rice: "Donald Trump should not be President."

(Photo by Vladimir Shtanko/Anadolu Agency/Getty Images)

South Dakota Senator John Thune: "Donald Trump should withdraw and Mike Pence should be our nominee effective immediately."

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Alaska Senator Lisa Murkowski: "I cannot and will not support Donald Trump for president."

(Photo by Matthew Busch/Bloomberg via Getty Images)

Nebraska Senator Ben Sasse: Donald trump "is obviously not going to win [and should] step aside."

(Photo credit SAUL LOEB/AFP/Getty Images)

Idaho Senator Mike Crapo: Donald Trump should step aside due to "disrespectful, profane and demeaning" behavior.

(Photo by Pete Marovich/Bloomberg via Getty Images)

Utah Senator Mike Lee: Donald Trump is a "distraction.

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Maine Senator Susan Collins: Donald Trump is "unsuitable for the presidency ... I [can] not support his candidacy."

(Photo By Bill Clark/CQ Roll Call)

Texas Senator John Cornyn: "I am disgusted by Mr Trump's words about women."

(Photo By Tom Williams/CQ Roll Call)

Former Utah Governor Jon Huntsman: "The time has come for Governor Pence to lead the ticket."

(Photo by Larry French/Getty Images)

Utah Representative Mia Love: Stated she "cannot vote for" Donald Trump. 

(Photo credit SAUL LOEB/AFP/Getty Images)

Ohio Senator Rob Portman: "I can no longer support [Trump]."

(AP Photo/Alex Brandon, File)

Colorado Representative Mike Coffman: Donald Trump should withdraw "for the good of the country."

(Photo By Brent Lewis/The Denver Post via Getty Images)

Missouri Representative Ann Wagner: "I withdraw my endorsement and call for Governor Pence to take the lead" in the race.

(Photo via REUTERS/Gary Cameron)

Nevada Representative Joe Heck: "I believe our only option is to formally ask Mr. Trump to step down."

(AP Photo/Julie Jacobson)

Arizona Senator Jeff Flake: Donald Trump is "wrong about his level of support. He needs to withdraw from the race."

(AP Photo/Ross D. Franklin, File)

Virginia Representative Barbara Comstock: Trump's remarks were "disgusting, vile, and disqualifying."

(Photo by Jahi Chikwendiu/The Washington Post via Getty Images)

Illinois Senator Mark Kirk: Donald Trump is a "malignant clown — unprepared and unfit to be president of the United States."

(AP Photo/M. Spencer Green, File)

Alaska Senator Dan Sullivan: "I will support Governor Mike Pence for President."

Andrew Harrer/Bloomberg via Getty Images

Colorado Senator Cory Gardner: Donald Trump's flaws are "beyond mere moral shortcomings ... I cannot and will not support someone who brags about degrading and assaulting women."

(Photo by Samuel Corum/Anadolu Agency/Getty Images)

New Jersey Representative Scott Garrett: Has stated he is "appalled" by Trump's actions.

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Nebraska Senator Deb Fischer: "It would be wise for [Trump] to step aside."

(AP Photo/J. Scott Applewhite)

South Dakota Governor Dennis Daugaard: "Enough is enough. Donald Trump should withdraw in favor of Governor Mike Pence."

(AP Photo/James Nord)

Former New York Governor George Pataki: "Enough! [Trump] needs to step down."

(Photo by Alex Wong/Getty Images)

Former GOP presidential candidate Carly Fiorina: "Donald Trump does not represent me or my party."

(AP Photo/Michael Conroy)

Michigan Representative Fred Upton: Donald Trump needs to "step down."

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Tennessee Governor Bill Haslam: Trump should "step aside and let Gov. Mike Pence assume the role as the party's nominee."

(Photo by Jason Davis/Getty Images)

Utah Governor Gary Herbert: "I will not vote for Trump."

(Photo by James MacDonald/Bloomberg via Getty Images)

Alabama Governor Robert Bentley: "I cannot and will not vote for Donald Trump."

(AP Photo/Brynn Anderson)

California Representative Steve Knight: Trump's comments were "inexcusable."

(Photo by Andrew Harrer/Bloomberg via Getty Images)

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