Cruz adviser says Trump campaign taking 'banana republic' approach

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Donald Trump And Ted Cruz Complain Like Children

WASHINGTON, April 17 (Reuters) - A senior adviser to Republican presidential candidate Ted Cruz on Sunday accused rival Donald Trump's campaign of taking a "banana republic approach" by complaining that party rules for selecting a nominee are rigged against him.

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Former Virginia Attorney General Ken Cuccinelli, the Texas senator's delegate operations manager, said on ABC's "This Week" that the Trump campaign is challenging the delegate selection process "because they're getting beat on the ground."

Cuccinelli and Trump's campaign manager, Corey Lewandowski, as well as the third Republican candidate, Ohio Governor John Kasich, traded punches over the delegate selection process on Sunday news shows.

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Ted Cruz on the campaign trail
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Cruz adviser says Trump campaign taking 'banana republic' approach
STAFFORD-MARCH 1: Ted Cruz holds his victory rally at the Redneck Country Club in Stafford, Texas. On the left is his wife, Heidi and their two daughters and on the right is the Lt. Governor of Texas, Dan Patrick. (Photo by Lucian Perkins /for The Washington Post via Getty Images)
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, stands on stage during a Super Tuesday night event in Houston, Texas, U.S., on Tuesday, March 1, 2016. Cruz said Monday in Dallas that Super Tuesday will make the Republican primary a 'two-man race,' predicting that he and Donald Trump will finish far ahead of rivals Marco Rubio, John Kasich and Ben Carson in terms of delegates. Photographer: Matthew Busch/Bloomberg via Getty Images
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, greets attendees with his wife Heidi Cruz and children during a campaign event in San Antonio, Texas, U.S., on Monday, Feb. 29, 2016. Cruz said Monday in Dallas that Super Tuesday will make the Republican primary a 'two-man race,' predicting that he and Donald Trump will finish far ahead of rivals Marco Rubio, John Kasich and Ben Carson in terms of delegates. Photographer: Matthew Busch/Bloomberg via Getty Images *** Local Captions *** Ted Cruz; Heidi Cruz
US Republican presidential hopeful Sen. Ted Cruz speaks at a presidential campaign rally in Dallas, Texas on February 29, 2016 one day before the 'Super Tuesday' primaries. Americans in a dozen states head to the polls for a slew of primaries and caucuses March 1 on what is considered the most important day of the presidential nominations calendar. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
UNITED STATES - FEBRUARY 27: Presidential candidate Sen. Ted Cruz, R-Texas, arrives for a campaign rally near the Georgia State Capitol Building in Atlanta, Ga., February 27, 2016. (Photo By Tom Williams/CQ Roll Call)
HOUSTON, TX - FEBRUARY 24: Republican presidential candidate U.S. Sen Ted Cruz (R-TX) greets people during a campaign rally at the Mach Industrial Group on February 24, 2016 in Houston, Texas. The process to select the next Democratic and Republican Presidential candidates continues. (Photo by Joe Raedle/Getty Images)
AMES, IA - JANUARY 30: Republican presidential candidate Sen. Ted Cruz (R-TX) arrives at a campaign event at the Gateway Hotel on January 30, 2016 in Ames, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)
DES MOINES, IA - JANUARY 31: Republican presidential candidate Sen. Ted Cruz (R-TX) speaks to Iowa voters at the Iowa State Fairgrounds January 31, 2016 in Des Moines, Iowa. The U.S. presidential election kicks off tomorrow with the state's caucuses. (Photo by Win McNamee/Getty Images)
HAMLIN, IA - JANUARY 30: Republican presidential candidate Sen. Ted Cruz (R-TX) speaks at a campaign event at Darrell's Place on January 30, 2016 in Hamlin, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)
HAMLIN, IA - JANUARY 30: Republican presidential candidate Sen. Ted Cruz (R-TX) (C) greets an audience member as he is introduced at a campaign event at Darrell's Place on January 30, 2016 in Hamlin, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)
Republican presidential candidate, Sen. Ted Cruz, R-Texas speaks during a campaign stop at the Freedom Country Store, Tuesday, Jan. 19, 2016, in Freedom, N.H. (AP Photo/John Minchillo)
Republican presidential candidate, Sen. Ted Cruz, R-Texas, departs a campaign stop, Monday, Jan. 18, 2016, in Washington, N.H. (AP Photo/Matt Rourke)
Shown is Republican presidential candidate, Sen. Ted Cruz, R-Texas, shadow as he speaks during a campaign stop Wednesday, Jan. 20, 2016, in Hollis, N.H. (AP Photo/Matt Rourke)
Delaney Anne tries to make a selfie with Republican presidential candidate, Sen. Ted Cruz, R-Texas, during a campaign stop, Monday, Jan. 18, 2016, in Tilton, N.H. (AP Photo/Matt Rourke)
Republican Presidential candidate Sen. Ted Cruz, R-Texas, campaigns at Penny's Diner in Missouri Valley, Iowa, Monday, Jan. 4, 2016. (AP Photo/Nati Harnik)
LAS VEGAS, NV - DECEMBER 17: Republican presidential candidate Sen. Ted Cruz (R-TX) speaks during a campaign rally at the Siena Community Center on December 17, 2015 in Las Vegas, Nevada. Two days after participating in the fifth GOP presidential debate, Cruz began a swing through eight Super Tuesday states in five days. (Photo by Ethan Miller/Getty Images)
Republican presidential candidate Sen. Ted Cruz, R-Texas, speaks during a town hall meeting at Furman University on Monday, Dec. 7, 2015, in Greenville, S.C. (AP Photo/Rainier Ehrhardt)
Republican presidential candidate Sen. Ted Cruz, R-Texas, speaks Saturday, Dec. 5, 2015, during the Rising Tide Summit at the US Cellular Center in Cedar Rapids, Iowa. (AP Photo/Scott Morgan)
Republican presidential candidate Sen. Ted Cruz, R-Texas speaks to supporters on the Statehouse steps in Concord, N.H., Thursday, Nov. 12, 2015, after filing papers to be on the nation's earliest presidential primary ballot. (AP Photo/Jim Cole)
WASHINGTON, DC - DECEMBER 03: Republican presidential candidate Sen. Ted Cruz (R-TX) leads a moment of silence for victims of the San Bernardino shooting prior to his address to the Republican Jewish Coalition at Ronald Reagan Building and International Trade Center December 3, 2015 in Washington, DC. Candidates spoke and took questions from Jewish leaders and activists. (Photo by Alex Wong/Getty Images)
Republican presidential candidate Sen. Ted Cruz, R-Texas, shops for jewelry from ChildVoice International with his daughters Catherine, left, and Caroline during a campaign stop at the Deerfield Fair Friday, Oct. 2, 2015, in Deerfield, N.H. ChildVoice International is a non-profit organization seeking to restore the voices of children silenced by war.(AP Photo/Jim Cole)
Republican Presidential candidate Donald Trump, right, speaks with fellow Republican presidential candidate Sen. Ted Cruz, R-Texas, during a rally opposing the Iran nuclear deal outside the Capitol in Washington, Wednesday, Sept. 9, 2015. (AP Photo/Susan Walsh)
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, speaks during a Tea Party Patriots rally against the Iran nuclear deal on Capitol Hill in Washington, D.C., U.S., on Wednesday, Sept. 9, 2015. A revolt among U.S. House Republicans delayed action on the Iran nuclear deal today as some members insisted they aren't bound by a Sept. 17 deadline in their efforts to kill the agreement. Photographer: Andrew Harrer/Bloomberg via Getty Images
Republican presidential candidate Texas Sen. Ted Cruz, center, right, posses for a photo with Timothy Lewis after a campaign event at the Stockyards in Forth Worth, Texas, Thursday, Sept. 3, 2015. (AP Photo/LM Otero)
Photographed through attendees, Republican presidential candidate, Sen. Ted Cruz, R-Texas, speaks at the Americans for Prosperity Road to Reform event Friday, Aug. 14, 2015, in Las Vegas. (AP Photo/John Locher)
DES MOINES, IA - AUGUST 21: Republican presidential candidate Sen. Ted Cruz (R-TX) speaks to supporters at his Religious Liberty Rally on August 21, 2015 in Des Moines, Iowa. Earlier in the day Republican presidential candidate Sen. Ted Cruz (R-TX) visited and spoke to guests at the Iowa State Fair. (Photo by Scott Olson/Getty Images)
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, speaks at the Iowa State Fair Soapbox in Des Moines, Iowa, U.S., on Friday, Aug. 21, 2015. A day after Jimmy Carter appeared on national television to talk about the cancer that's ravaging his body, Cruz criticized the former president's administration in a speech in Iowa. Photographer: Daniel Acker/Bloomberg via Getty Images
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, eats a pork chop at the Iowa Pork Producers tent during the Iowa State Fair in Des Moines, Iowa, U.S., on Friday, Aug. 21, 2015. A day after Jimmy Carter appeared on national television to talk about the cancer that's ravaging his body, Cruz criticized the former president's administration in a speech in Iowa. Photographer: Daniel Acker/Bloomberg via Getty Images
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, speaks at the Rally for Religious Liberty in Des Moines, Iowa, U.S., on Friday, Aug. 21, 2015. A day after Jimmy Carter appeared on national television to talk about the cancer that's ravaging his body, Republican presidential candidate Cruz criticized the former president's administration in a speech in Iowa. Photographer: Daniel Acker/Bloomberg via Getty Images
UNITED STATES - AUGUST 8: Presidential candidate Sen. Ted Cruz (R-TX) spends a few moments with his daughter Catherine before the start of the Cruz bus tour rally in a field behind Sprayberry's BBQ in Newnan, Ga., on Saturday, Aug. 8, 2015. (Photo By Bill Clark/CQ Roll Call)
Texas Senator Ted Cruz participates in the Republican presidential primary debate on August 6, 2015 at the Quicken Loans Arena in Cleveland, Ohio. AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
UNITED STATES - JULY 29: Sen. Ted Cruz, R-Texas, awaits for the elevator doors to close as he arrives in the basement of the Capitol, July 29, 2015. (Photo By Al Drago/CQ Roll Call)
WASHINGTON, DC - JULY 28: Republican presidential candidate, U.S. Sen. Ted Cruz (R-TX) speaks during a Anti-abortion rally opposing federal funding for Planned Parenthood in front of the U.S. Capitol July 28, 2015 in Washington, DC. Sen. Rand Paul (R-KY) announced a Senate deal to vote on legislation to defund Planned Parenthood before the Senate goes into recess in August. (Photo by Olivier Douliery/Getty Images)
Sen. Ted Cruz, R-Texas, speaks to reporters following a rare Sunday Senate session on Capitol Hill in Washington, Sunday, July 26, 2015. Senior Senate Republicans lined up Sunday to rebuke Cruz for attacking Majority Leader Mitch McConnell, an extraordinary display of intraparty division played out live on the Senate floor. (AP Photo/Manuel Balce Ceneta)
WASHINGTON, USA - JULY 23: Republican Presidential Candidate Senator Ted Cruz speaks out against the nuclear deal with Iran during a demonstration that was interrupted by counter protestors in Lafayette Park across the the street from the White House in Washington, DC on July 23, 2015. (Photo by Samuel Corum/Anadolu Agency/Getty Images)
Senator Ted Cruz, a Republican from Texas and 2016 U.S. presidential candidate, speaks during The Family Leadership Summit in Ames, Iowa, U.S., on Saturday, July 18, 2015. The sponsor, The FAMiLY LEADER, is a 'pro-family, pro-marriage, pro-life organization which champions the principle that God is the ultimate leader of the family.' Photographer: Daniel Acker/Bloomberg via Getty Images
AMES, IA - JULY 18: Republican presidential hopeful Senator Ted Cruz of Texas fields questions at The Family Leadership Summit at Stephens Auditorium on July 18, 2015 in Ames, Iowa. According to the organizers the purpose of The Family Leadership Summit is to inspire, motivate, and educate conservatives. (Photo by Scott Olson/Getty Images)
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, stands outside while waiting to speak during the Faith and Freedom Coalition's 'Road to Majority' legislative luncheon in Washington, D.C., U.S., on Thursday, June 18, 2015. The annual Faith & Freedom Coalition Policy Conference gives top-tier presidential contenders as well as long shots a chance to compete for the large evangelical Christian base in the crowded Republican primary contest. Photographer: Andrew Harrer/Bloomberg via Getty Images
WASHINGTON, DC - JUNE 04: Sen. Ted Cruz (R-TX) participates in a Judiciary Subcommittee hearing on the Affordable Care Act on Capitol Hill June 4, 2015 in Washington, DC. The hearing is billed as 'Rewriting The Law, Examining the Process That Led to the ObamaCare Subsidy Rule'. (Photo by Mark Wilson/Getty Images)
Senator Ted Cruz, a Republican from Texas and 2016 presidential candidate, speaks during a press conference at the Hampton Inn and Suites in Seneca, South Carolina, U.S., on Wednesday, Feb. 17, 2016. Cruz says Donald Trump sent his lawyers cease and desist letters over a Cruz campaign ad that portrays Trump as pro-choice saying that if the Cruz campaign doesn't pull ad, they'll see immediate legal action to prevent the continued broadcast of this ad, according to Cruz. Photographer: Daniel Acker/Bloomberg via Getty Images
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Trump remains the front-runner in the race to be the Republican Party's candidate in November's general election. But it remains unclear whether the billionaire businessman will arrive at the party's July 18-21 convention in Cleveland with the 1,237-delegate majority needed to clinch the nomination on the first ballot.

The next big face-off is New York state's primary on Tuesday, with 95 delegates at stake.

Opinion polls show Trump, a New Yorker, well ahead of his rivals, with Kasich and Cruz trailing behind. The latest CBS News poll, released on Sunday, show Trump supported by 49 percent of those surveyed, followed by 31 percent for Cruz and 16 percent for Kasich.

On the Democratic side, Hillary Clinton, a former New York senator and U.S. secretary of state, and U.S. Senator Bernie Sanders of Vermont will also face New York voters on Tuesday. Polls show Clinton is still favored to win, although Sanders, a New York City native who is hoping for an upset win to ensure the continued viability of his campaign, has managed to narrow the gap in recent days.

Trump, meanwhile, has become increasingly agitated as the Cruz campaign outmaneuvers him in the complex art of securing delegates that are not simply allocated by a popular vote.

At a news conference in New York City's Staten Island borough on Sunday, he repeated his assertion that the system was "crooked."

"You're basically buying these people," he said, referring to convention delegates.

"I could put them in the best planes and bring them to the best places in the world," he added. But he said he was not interested in wooing delegates that way, describing it as undemocratic.

See Trump on the campaign trail in New York:

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Donald Trump event in New York
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Cruz adviser says Trump campaign taking 'banana republic' approach
U.S. Republican presidential candidate Donald Trump reads the lyrics of Al Wilson's song "The Snake" during campaign event at Grumman Studios in Bethpage, New York April 6, 2016 REUTERS/Carlo Allegri
U.S. Republican presidential candidate Donald Trump reads the lyrics of Al Wilson's song "The Snake" during campaign event at Grumman Studios in Bethpage, New York April 6, 2016. REUTERS/Carlo Allegri
Supporters of U.S. Republican presidential candidate Donald Trump listen during a campaign event at Grumman Studios in Bethpage, New York April 6, 2016. REUTERS/Shannon Stapleton
U.S. Republican presidential candidate Donald Trump speaks on stage during campaign event at Grumman Studios in Bethpage, New York April 6, 2016 REUTERS/Carlo Allegri
A supporter of U.S. Republican presidential candidate Donald Trump holds a sign during a campaign event at Grumman Studios in Bethpage, New York April 6, 2016. REUTERS/Shannon Stapleton
Supporters of U.S. Republican presidential candidate Donald Trump cheer during a campaign event at Grumman Studios in Bethpage, New York April 6, 2016. REUTERS/Shannon Stapleton
U.S. Republican presidential candidate Donald Trump speaks on stage during campaign event at Grumman Studios in Bethpage, New York April 6, 2016 REUTERS/Carlo Allegri
Supporters of U.S. Republican presidential candidate Donald Trump cheer during a campaign event at Grumman Studios in Bethpage, New York April 6, 2016. REUTERS/Shannon Stapleton
A supporter of U.S. Republican presidential candidate Donald Trump takes a photo during a campaign event at Grumman Studios in Bethpage, New York April 6, 2016. REUTERS/Shannon Stapleton
Supporters of U.S. Republican presidential candidate Donald Trump cheer during a campaign event at Grumman Studios in Bethpage, New York April 6, 2016. REUTERS/Shannon Stapleton
U.S. Republican presidential candidate Donald Trump points to supporters after a campaign event at Grumman Studios in Bethpage, New York April 6, 2016. REUTERS/Shannon Stapleton
A man reacts as U.S. Republican presidential candidate Trump speaks on stage during a campaign event at Grumman Studios in Bethpage, New York April 6, 2016 REUTERS/Carlo Allegri
Supporters of U.S. Republican presidential candidate Donald Trump cheer during a campaign event at Grumman Studios in Bethpage, New York April 6, 2016. REUTERS/Shannon Stapleton
U.S. Republican presidential candidate Donald Trump holds up a sign during a campaign event at Grumman Studios in Bethpage, New York April 6, 2016. REUTERS/Shannon Stapleton
U.S. Republican presidential candidate Donald Trump points during a campaign event at Grumman Studios in Bethpage, New York April 6, 2016. REUTERS/Shannon Stapleton
Ivanka Trump, daughter of Republican presidential candidate Donald Trump, introduces her father at a campaign rally in Bethpage, New York April 6, 2016. REUTERS/Carlo Allegri
Supporters of U.S. Republican presidential candidate Donald Trump wait for campaign event to begin at Grumman Studios in Bethpage, New York April 6, 2016. REUTERS/Shannon Stapleton
A supporter of U.S. Republican presidential candidate Donald Trump stands with a walker in front of portable toilets before a campaign event at Grumman Studios in Bethpage, New York April 6, 2016. REUTERS/Shannon Stapleton
Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, speaks during a campaign event in Bethpage, New York, U.S., on Wednesday, April 6, 2016. Texas Senator Ted Cruz beat Trump in Wisconsin's Republican presidential primary on Tuesday, embarrassing the front-runner, extending an increasingly bitter nomination fight and boosting the odds of a contested national convention in July. Photographer: John Taggart/Bloomberg via Getty Images
A tattoo is seen on an attendee during a campaign event for Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, not pictured, in Bethpage, New York, U.S., on Wednesday, April 6, 2016. Texas Senator Ted Cruz beat Trump in Wisconsin's Republican presidential primary on Tuesday, embarrassing the front-runner, extending an increasingly bitter nomination fight and boosting the odds of a contested national convention in July. Photographer: John Taggart/Bloomberg via Getty Images
Attendees wait for the start of a campaign event for Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, not pictured, in Bethpage, New York, U.S., on Wednesday, April 6, 2016. Texas Senator Ted Cruz beat Trump in Wisconsin's Republican presidential primary on Tuesday, embarrassing the front-runner, extending an increasingly bitter nomination fight and boosting the odds of a contested national convention in July. Photographer: John Taggart/Bloomberg via Getty Images
Attendees wait for the start of a campaign event for Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, not pictured, in Bethpage, New York, U.S., on Wednesday, April 6, 2016. Texas Senator Ted Cruz beat Trump in Wisconsin's Republican presidential primary on Tuesday, embarrassing the front-runner, extending an increasingly bitter nomination fight and boosting the odds of a contested national convention in July. Photographer: John Taggart/Bloomberg via Getty Images
Security guards escort a protester from a campaign event for Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, not pictured, in Bethpage, New York, U.S., on Wednesday, April 6, 2016. Texas Senator Ted Cruz beat Trump in Wisconsin's Republican presidential primary on Tuesday, embarrassing the front-runner, extending an increasingly bitter nomination fight and boosting the odds of a contested national convention in July. Photographer: John Taggart/Bloomberg via Getty Images
An attendee wears an American flag at a campaign event for Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, not pictured, in Bethpage, New York, U.S., on Wednesday, April 6, 2016. Texas Senator Ted Cruz beat Trump in Wisconsin's Republican presidential primary on Tuesday, embarrassing the front-runner, extending an increasingly bitter nomination fight and boosting the odds of a contested national convention in July. Photographer: John Taggart/Bloomberg via Getty Images
Security guards escort a protester from the start of a campaign event for Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, not pictured, in Bethpage, New York, U.S., on Wednesday, April 6, 2016. Texas Senator Ted Cruz beat Trump in Wisconsin's Republican presidential primary on Tuesday, embarrassing the front-runner, extending an increasingly bitter nomination fight and boosting the odds of a contested national convention in July. Photographer: John Taggart/Bloomberg via Getty Images
Attendees wait for the start of a campaign event for Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, not pictured, in Bethpage, New York, U.S., on Wednesday, April 6, 2016. Texas Senator Ted Cruz beat Trump in Wisconsin's Republican presidential primary on Tuesday, embarrassing the front-runner, extending an increasingly bitter nomination fight and boosting the odds of a contested national convention in July. Photographer: John Taggart/Bloomberg via Getty Images
BETHPAGE, NEW YORK - APRIL 06: A supporter holds a up a book by Republican Presidential Candidate Donald Trump prior to a campaign rally on April 6, 2016 in Bethpage, New York. The rally comes ahead of the April 15 New York primary. (Photo by Andrew Renneisen/Getty Images)
Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, center right, waves to attendees during a campaign event in Bethpage, New York, U.S., on Wednesday, April 6, 2016. Texas Senator Ted Cruz beat Trump in Wisconsin's Republican presidential primary on Tuesday, embarrassing the front-runner, extending an increasingly bitter nomination fight and boosting the odds of a contested national convention in July. Photographer: John Taggart/Bloomberg via Getty Images
BETHPAGE, NEW YORK - APRIL 06: Supporters pose for a picture prior to a campaign rally for Republican Presidential Candidate Donald Trump on April 6, 2016 in Bethpage, New York. The rally comes ahead of the April 15 New York primary. (Photo by Andrew Renneisen/Getty Images)
BETHPAGE, NEW YORK - APRIL 06: Supporters gather for Republican Presidential Candidate Donald Trump prior to a campaign rally on April 6, 2016 in Bethpage, New York. The rally comes ahead of the April 15 New York primary. (Photo by Andrew Renneisen/Getty Images)
BETHPAGE, NEW YORK - APRIL 06: Republican Presidential Candidate Donald Trump speaks at a campaign rally on April 6, 2016 in Bethpage, New York. The rally comes ahead of the April 15 New York primary. (Photo by Andrew Renneisen/Getty Images)
BETHPAGE, NEW YORK - APRIL 06: Supporters cheer during a rally for Republican Presidential Candidate Donald Trump on April 6, 2016 in Bethpage, New York. The rally comes ahead of the April 15 New York primary. (Photo by Andrew Renneisen/Getty Images)
BETHPAGE, NEW YORK - APRIL 06: A Trump supporter holds up a 'White Lives Matter' sign during a rally for Republican Presidential Candidate Donald Trump on April 6, 2016 in Bethpage, New York. The rally comes ahead of the April 15 New York primary. (Photo by Andrew Renneisen/Getty Images)
Supporters await the arrival of US Republican presidential candidate Donald Trump during a rally in Bethpage Long Island, New York on April 6, 2016. Trump looks to bounce back from his unsettling presidential primary los in Wisconsin, training his sights in the next White House contests on friendlier ground -- his home state of New York. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
BETHPAGE, NEW YORK - APRIL 06: Republican Presidential Candidate Donald Trump speaks at a campaign rally on April 6, 2016 in Bethpage, New York. The rally comes ahead of the April 15 New York primary. (Photo by Andrew Renneisen/Getty Images)
BETHPAGE, NEW YORK - APRIL 06: Republican Presidential Candidate Donald Trump interacts with supporters following a campaign rally on April 6, 2016 in Bethpage, New York. The rally comes ahead of the April 15 New York primary. (Photo by Andrew Renneisen/Getty Images)
BETHPAGE, NEW YORK - APRIL 06: Republican Presidential Candidate Donald Trump speaks at a campaign rally on April 6, 2016 in Bethpage, New York. The rally comes ahead of the April 15 New York primary. (Photo by Andrew Renneisen/Getty Images)
US Republican presidential candidate Donald Trump addresses a rally in Bethpage, Long Island, New York on April 6, 2016. Trump looks to bounce back from his unsettling presidential primary los in Wisconsin, training his sights in the next White House contests on friendlier ground -- his home state of New York. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
Donald Trump supporters yell toward people protesting Trump near the site of a campaign appearance by Republican presidential candidate Donald Trump in Bethpage, New York, Wednesday, April 6, 2016. (AP Photo/Craig Ruttle)
Republican presidential candidate Donald Trump speaks during a campaign rally, Wednesday, April 6, 2016, in Bethpage, N.Y. (AP Photo/Julie Jacobson)
Republican presidential candidate Donald Trump holds up a sign handed to him by a supporter after speaking at a campaign rally, Wednesday, April 6, 2016, in Bethpage, N.Y. (AP Photo/Julie Jacobson)
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The party rules for picking delegates vary by state.

Cuccinelli said Cruz has been "winning elections. And when we win, Trump whines."

"This is a banana republic approach from the Trump team," he said. "... They have a media campaign. But Ted Cruz has built a grassroots campaign."

On "Fox News Sunday," Trump's Lewandowski pointed to Florida, where the candidate won the primary in a landslide. But Trump can count on the support of only 69 of the state's 99 delegates because the state Republican Party chairman is allowed to appoint 30.

"Ted Cruz does well in places where party bosses get to set those rules and people don't get to go and vote," Lewandowski said.

Another senior Trump adviser, delegate selection specialist Paul Manafort, told ABC the campaign will protest results in Missouri and Colorado.

But in several interviews on Sunday, Republican National Committee Chairman Reince Priebus again denied that the delegate selection rules are rigged against Trump.

Kasich ridiculed Trump and his campaign for suggesting the delegate selection rules are fixed and that a "dirty trick" allowed Cruz to win Colorado's nominating contest without a statewide vote.

Kasich, interviewed by CNN, said Trump should "act like you're a professional. Be a pro."

(Reporting by Diane Bartz, Lisa Lambert and David Shepardson in Washington and Jonathan Allen in New York; Writing by David Shepardson; Editing by Jonathan Oatis)

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