Trump criticizes Ben Carson, says he doesn't have 'energy'

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Donald Trump, Ben Carson Tied in New Iowa Poll

BOONE, Iowa (AP) -- With Rick Perry out of the Republican race for president, Donald Trump on Saturday focused his barbs on another opponent in the crowded field of primary candidates, retired neurosurgeon Ben Carson.

In polls in national and early-voting states, Carson is second only to Trump. He recently cast doubt on the real estate mogul's religious faith, questioning his "fear of the Lord," then backed off the comment and would not repeat it.

"You don't hit a person on faith," Trump told hundreds of people at a rally in Boone.

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Ben Carson on the campaign trail
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Trump criticizes Ben Carson, says he doesn't have 'energy'
Republican presidential candidate Dr. Ben Carson gestures while speaking during a town hall at Abundant Life Ministries in Jefferson, Iowa, Monday, Jan. 11, 2016. (AP Photo/Patrick Semansky)
MT. AYR, IA - JANUARY 22 : Republican presidential candidate Ben Carson is introduced during his 'Trust in God Townhall' campaign stop January 22, 2016 in Mt. Ayr, Iowa. Carson, who is seeking the nomination from the Republican Party is on the presidential campaign trail across Iowa ahead of the Iowa Caucus taking place February 1. (Photo by Joshua Lott/Getty Images)
Republican presidential candidate Dr. Ben Carson walks through the National Motorcycle Museum in Anamosa, Iowa, Thursday, Jan. 7, 2016, after holding a town hall. (AP Photo/Patrick Semansky)
Republican presidential candidate Dr. Ben Carson smiles during an interview with The Associated Press in his home in Upperco, Md., Wednesday, Dec. 23, 2015. (AP Photo/Andrew Harnik)
Republican presidential candidate Dr. Ben Carson speaks during a campaign event at Cobb Energy Center Tuesday, Dec. 8, 2015, in Atlanta. (AP Photo/David Goldman)
Republican presidential candidate, Dr. Ben Carson speaks during a town hall meeting at Winthrop University on Wednesday, Dec. 2, 2015, in Rock Hill, S.C. (AP Photo/Rainier Ehrhardt)
Republican presidential candidate Dr. Ben Carson speaks at a rally Sunday, Nov. 15, 2015, in Henderson, Nev. (AP Photo/John Locher)
Ben Carson, 2016 Republican presidential candidate, speaks during a Liberty University Convocation in Lynchburg, Virginia, U.S., on Wednesday, Nov. 11, 2015. As retired neurosurgeon Carson has risen in the polls, media reports have revisited his accounts of acts of violence as a child, a key part of the redemption story he discusses on the campaign trail. Photographer: Andrew Harrer/Bloomberg via Getty Images
PALM BEACH GARDENS, FL - NOVEMBER 06: Republican presidential candidate Ben Carson speaks to the media before speaking at a gala for the Black Republican Caucus of South Florida at PGA National Resort on November 6, 2015 in Palm Beach, Florida. Carson has come under media scrutiny for possibly exaggerating his background and other statements he has made recently. (Photo by Joe Raedle/Getty Images)
Republican presidential candidate Ben Carson greets well-wishers during a campaign stop, Thursday, Oct. 29, 2015, in Lakewood, Colo. (AP Photo/David Zalubowski)
DES MOINES, IA - AUGUST 16: Republican presidential hopeful Ben Carson (L) eats a piece of pizza while touring the Iowa State Fair on August 16, 2015 in Des Moines, Iowa. Presidential candidates are addressing attendees at the Iowa State Fair on the Des Moines Register Presidential Soapbox stage and touring the fairgrounds. The State Fair runs through August 23. (Photo by Justin Sullivan/Getty Images)
Republican presidential candidate Ben Carson speaks during a campaign stop, Thursday, Oct. 29, 2015, in Lakewood, Colo. (AP Photo/David Zalubowski)
FILE - In this Oct. 24, 2015, file photo, Republican presidential candidate Dr. Ben Carson greets audience members after speaking at Iowa State University in Ames, Iowa. Seven in 10 Republican and Republican-leaning registered voters say Donald Trump could win the November 2016 election. That compares to 6 in 10 who say the same for retired neurosurgeon Carson, who, like Trump, has tapped into the powerful wave of anti-establishment anger defining the early phases of the 2016 contest. (AP Photo/Charlie Neibergall, File)
LAKEWOOD, CO - OCTOBER 29: Republican presidential candidate Ben Carson speaks during a news conference before a campaign event at Colorado Christian University on October 29, 2015 in Lakewood, Colorado. Ben Carson was back on the campaign trail a day after the third republican debate held at the University of Colorado Boulder. (Photo by Justin Sullivan/Getty Images)
Republican presidential candidate Dr. Ben Carson speaks outside the Alpha Gamma Rho fraternity at Iowa State University during a campaign stop, Saturday, Oct. 24, 2015, in Ames, Iowa. (AP Photo/Charlie Neibergall)
Republican presidential candidate Dr. Ben Carson, left, laughs as he wife, Candy Carson, waves to the crowd after saying a few words to the crowd supporting her husband in front of supporters Tuesday, Aug. 18, 2015, in Phoenix. (AP Photo/Ross D. Franklin)
Republican presidential candidate Dr. Ben Carson greets audience members following a town hall meeting, Friday, Oct. 2, 2015, in Ankeny, Iowa. (AP Photo/Charlie Neibergall)
Republican presidential candidate Dr. Ben Carson speaks at a luncheon at the National Press Club in Washington, Friday, Oct. 9, 2015. Carson is promoting a book he has co-authored with his wife Candy Carson entitled 'A More Perfect Union: What We the People Can Do to Reclaim Our Constitutional Liberties.' (AP Photo/Andrew Harnik)
WASHINGTON, DC - SEPTEMBER 25: Scenes around the the Value Voters Summit on September 25, 2015 in Washington DC. Republican presidential candidate Ben Carson takes the stage at the event. Dr Carson speaks to the media after the speach. (Photos by Charles Ommanney/The Washington Post via Getty Images)
Attendees wait for Ben Carson, 2016 Republican presidential candidate, not pictured, to arrive during a campaign stop at the birthplace of the Michigan Republican Party in Jackson, Michigan, U.S., on Wednesday, Sept. 23, 2015. Carson, the third candidate in the Republican race to have never held elected office, saw his numbers drop following the debate last week. Photographer: Luke Sharrett/Bloomberg via Getty Images
Republican presidential candidate Ben Carson speaks at a presidential forum sponsored by Heritage Action at the Bon Secours Wellness Arena, Friday, Sept. 18, 2015, in Greenville, S.C. (AP Photo/Richard Shiro)
Republican Presidential candidate Dr. Ben Carson during a speech to the Commonwealth Club public affairs forum Tuesday, Sept. 8, 2015, in San Francisco. (AP Photo/Eric Risberg)
Republican presidential candidate Ben Carson speaks at a rally in Little Rock, Ark., Thursday, Aug. 27, 2015. (AP Photo/Danny Johnston)
Republican presidential candidate Ben Carson is interviewed in Little Rock, Ark., Thursday, Aug. 27, 2015. (AP Photo/Danny Johnston)
Republican presidential candidate Ben Carson stands for a photo with a fairgoer at the Iowa State Fair Sunday, Aug. 16, 2015, in Des Moines. (AP Photo/Charlie Riedel)
Ben Carson, 2016 Republican presidential candidate, listens as he attends a service at Maple Street Missionary Baptist Church in Des Moines, Iowa, U.S., on Sunday, Aug. 16, 2015. Carson will be speaking at the Iowa State Fair, which is expected to host 18 presidential candidates and runs until Aug. 23. Photographer: Daniel Acker/Bloomberg via Getty Images
Republican presidential candidate Dr. Ben Carson speaks to hundreds of supporters at the Inaugural Basque Fry at Corley Ranch in Gardnerville, Nev. on Saturday, Aug. 15, 2015. (AP Photo/Lance Iversen)
CLEVELAND, OH - AUGUST 06: Republican presidential candidate Ben Carson participates in the first prime-time presidential debate hosted by FOX News and Facebook at the Quicken Loans Arena August 6, 2015 in Cleveland, Ohio. The top-ten GOP candidates were selected to participate in the debate based on their rank in an average of the five most recent national political polls. (Photo by Chip Somodevilla/Getty Images)
Republican presidential candidate, retired neurosurgeon Ben Carson, speaks at the Family Leadership Summit in Ames, Iowa, Saturday, July 18, 2015. (AP Photo/Nati Harnik)
Republican presidential candidate, retired neurosurgeon Ben Carson, right, speaks with pollster Frank Luntz at the Family Leadership Summit in Ames, Iowa, Saturday, July 18, 2015. (AP Photo/Nati Harnik)
Ben Carson, 2016 Republican presidential candidate, eats a slice of pizza as he tours the Iowa State Fair in Des Moines, Iowa, U.S., on Sunday, Aug. 16, 2015. In a Sunday interview with Fox News, Carson doubled down on his assertion that a speech given by President Barack Obama intended to sell the American public on his nuclear deal with Iran contained 'coded innuendos employing standard anti-Semitic themes.' Photographer: Daniel Acker/Bloomberg via Getty Images
Republican presidential candidate Ben Carson speaks at the National Sheriffs’ Association presidential forum, Tuesday, June 30, 2015, in Baltimore. (AP Photo/Patrick Semansky)
Republican presidential candidate Dr. Ben Carson is greeted by supporters during a fundraiser for U.S. Sen. Joni Ernst, R-Iowa, Saturday, June 6, 2015, in Boone, Iowa. (AP Photo/Charlie Neibergall)
Republican presidential hopeful Sen. Rand Paul, left, talks with Republican presidential hopeful Dr. Ben Carson during the Iowa Republican Party's Lincoln Dinner, Saturday, May 16, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)
Republican presidential candidate and retired neurosurgeon Ben Carson speaks at Manchester Community College, Sunday, May 10, 2015, in Manchester, N.H. (AP Photo/Mary Schwalm)
Republican presidential candidate Ben Carson speaks in town hall meeting in Baltimore Md., Thursday May 7, 2015. (AP Photo/Jose Luis Magana)
Ben Carson announces his candidacy for president during an official announcement in Detroit, Monday, May 4, 2015. Carson, 63, a retired neurosurgeon, begins the Republican primary as an underdog in a campaign expected to feature several seasoned politicians. (Photo/Paul Sancya)
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"I don't know him. He knows nothing about me. I'm protestant, I'm Presbyterian, I believe strongly, believe in the Bible strongly. But he hit me on my faith. No, I believe strongly. You don't hit a person on faith. And he was nice enough to apologize."

Trump, who has made a practice in public appearances and interviews of listing those he says have wronged him, told the crowd that he doesn't think Carson could negotiate effectively with world leaders.

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Donald Trump rally in Alabama
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Trump criticizes Ben Carson, says he doesn't have 'energy'
MOBILE, AL- AUGUST 21: Republican presidential candidate Donald Trump speaks during a rally at Ladd-Peebles Stadium on August 21, 2015 in Mobile, Alabama. The Trump campaign moved tonight's rally to a larger stadium to accommodate demand. (Photo by Mark Wallheiser/Getty Images)
MOBILE, AL- AUGUST 21: Republican presidential candidate Donald Trump speaks during a rally at Ladd-Peebles Stadium on August 21, 2015 in Mobile, Alabama. The Trump campaign moved tonight's rally to a larger stadium to accommodate demand. (Photo by Mark Wallheiser/Getty Images)
MOBILE, AL- AUGUST 21: Republican presidential candidate Donald Trump speaks during a rally at Ladd-Peebles Stadium on August 21, 2015 in Mobile, Alabama. The Trump campaign moved tonight's rally to a larger stadium to accommodate demand. (Photo by Mark Wallheiser/Getty Images)
MOBILE, AL- AUGUST 21: Republican presidential candidate Donald Trump greets supporters after his rally at Ladd-Peebles Stadium on August 21, 2015 in Mobile, Alabama. The Trump campaign moved tonight's rally to a larger stadium to accommodate demand. (Photo by Mark Wallheiser/Getty Images)
MOBILE, AL- AUGUST 21: Republican presidential candidate Donald Trump greets supporters after his rally at Ladd-Peebles Stadium on August 21, 2015 in Mobile, Alabama. The Trump campaign moved tonight's rally to a larger stadium to accommodate demand. (Photo by Mark Wallheiser/Getty Images)
MOBILE, AL- AUGUST 21: Republican presidential candidate Donald Trump greets supporters after his rally at Ladd-Peebles Stadium on August 21, 2015 in Mobile, Alabama. The Trump campaign moved tonight's rally to a larger stadium to accommodate demand. (Photo by Mark Wallheiser/Getty Images)
Republican presidential candidate Donald Trump speaks during a campaign rally in Mobile, Ala., on Friday, Aug. 21, 2015. (AP Photo/Brynn Anderson)
The crowd cheers when Republican presidential candidate businessman Donald Trump speaks during a campaign pep rally, Friday, Aug. 21, 2015, in Mobile, Ala. (AP Photo/Brynn Anderson)
Republican presidential candidate Donald Trump speaks during a campaign pep rally, Friday, Aug. 21, 2015, in Mobile, Ala. (AP Photo/Brynn Anderson)
MOBILE, AL- AUGUST 21: Republican presidential candidate Donald Trump speaks during a rally at Ladd-Peebles Stadium on August 21, 2015 in Mobile, Alabama. The Trump campaign moved tonight's rally to a larger stadium to accommodate demand. (Photo by Mark Wallheiser/Getty Images)
Buttons supporting Republican presidential candidate businessman Donald Trump are displayed at a campaign pep rally, Friday, Aug. 21, 2015, in Mobile, Ala. (AP Photo/Brynn Anderson)
MOBILE, AL- AUGUST 21: Republican presidential candidate Donald Trump speaks during a rally at Ladd-Peebles Stadium on August 21, 2015 in Mobile, Alabama. The Trump campaign moved tonight's rally to a larger stadium to accommodate demand. (Photo by Mark Wallheiser/Getty Images)
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"I don't think Ben has the energy," Trump said. "Ben is a nice man, but when you're negotiating against China and you're negotiating against these Japanese guys that are going to come against you in waves, and they think we're all a bunch of jerks `cause our leaders are so stupid and so incompetent and so inept, we need people that are really smart, that have tremendous deal-making skills and that have great, great energy."

Trump traveled to Ames, where Iowa State hosted rival Iowa for a football game that is one the state's largest single-day gatherings. Although he had been scheduled to mingle with tailgating fans outside of Jack Trice Stadium and talk at the Iowa Republican Party tent, he instead went inside the stadium to meet with Iowa State President Steven Leath. He later posed for photos with fans and cheerleaders as he walked around the field's perimeter.

Three other Republican hopefuls met with tailgating fans -- Wisconsin Gov. Scott Walker and Sens. Rand Paul of Kentucky and Marco Rubio of Florida.

Walker waded through the throngs of crimson-wearing Iowa State Cyclone and black-and-gold-clad Iowa Hawkeye fans, unrecognized by many. Ben Larsen, who drove three hours from Blair, Nebraska, to see candidates, shook Walker's hand and smiled, though he later said, "I'm more a Rubio guy."

Hours earlier, Rubio told reporters that Perry "is a good man" and "I'm sure he's not done serving our country." A day earlier, Walker made a more public pitch for Perry's supporters while campaigning in eastern Iowa.

Perry said Friday evening that he was suspending his campaign.

Watch more coverage below:

Donald Trump Says Goodbye to Rick Perry

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