Mitt Romney: Trump will win the nomination if Cruz and Kasich stay in the race

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Mitt Romney suggested on Monday that Manhattan billionaire Donald Trump would secure the GOP nomination if Texas Sen. Ted Cruz and Ohio Gov. John Kasich stay in the race until the July convention.

In a preview of his interview with David Gregory for his podcast, "The David Gregory Show," Romney insisted that stopping Trump depends on whether Cruz and Kasich continue campaigning.

"I think that Mr. Cruz and Mr. Kasich divide the vote, and that makes it easier for Mr. Trump to win the winner-take-all congressional districts and the winner-take-all states and get the delegates he needs to either hit the 1,237 or get close enough to sway the uncommitted delegates on the first ballot," said Romney, the 2012 GOP presidential nominee.

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Mitt Romney: Trump will win the nomination if Cruz and Kasich stay in the race
A masked supporter dances before Republican U.S. presidential candidate Donald Trump arrives at a campaign town hall event in Wausau, Wisconsin April 2, 2016. REUTERS/Ben Brewer
U.S. Republican presidential candidate Donald Trump greets supporters at a campaign rally in San Jose, California, U.S. June 2, 2016. REUTERS/Lucy Nicholson
Supporters cheer for U.S. Republican presidential candidate Donald Trump at a campaign rally in San Jose, California, U.S. June 2, 2016. REUTERS/Lucy Nicholson
People say the pledge of allegiance before listening to U.S. Republican presidential candidate Donald Trump speak at a campaign rally in San Jose, California, U.S. June 2, 2016. REUTERS/Lucy Nicholson
Supporters wait for U.S. Republican presidential candidate Donald Trump to speak at a campaign rally in San Jose, California, U.S. June 2, 2016. REUTERS/Lucy Nicholson
Supporters cheer for U.S. Republican presidential candidate Donald Trump as he speaks at a campaign rally in San Jose, California, U.S. June 2, 2016. REUTERS/Lucy Nicholson
Supporters (L-R) Annalisa Wales, 12, Scarlett Wales, 9, Barbara Wales, 68, and Katherine Wales, 10, wait for U.S. Republican presidential candidate Donald Trump to speak at a campaign rally in San Jose, California, U.S. June 2, 2016. REUTERS/Lucy Nicholson
Supporters cheer for U.S. Republican presidential candidate Donald Trump at a campaign rally in San Jose, California, U.S. June 2, 2016. REUTERS/Lucy Nicholson
U.S. Republican presidential candidate Donald Trump greets supporters at a campaign rally in San Jose, California, U.S. June 2, 2016. REUTERS/Lucy Nicholson
U.S. Republican presidential candidate Donald Trump greets supporters at a campaign rally in San Jose, California, U.S. June 2, 2016. REUTERS/Lucy Nicholson
U.S. Republican presidential candidate Donald Trump greets supporters at a campaign rally in San Jose, California, U.S. June 2, 2016. REUTERS/Lucy Nicholson
People listen to U.S. Republican presidential candidate Donald Trump speak at a campaign rally in Sacramento, California, U.S. June 1, 2016. REUTERS/Lucy Nicholson
A man carries a sign for Republican U.S. presidential candidate Donald Trump at the Rolling Thunder motorcycle rally to highlight POW-MIA issues on Memorial Day weekend in Washington, U.S. May 29, 2016. REUTERS/Jonathan Ernst
People watch Republican U.S. presidential candidate Donald Trump address the Rolling Thunder motorcycle rally to highlight POW-MIA issues on Memorial Day weekend in Washington, U.S. May 29, 2016. REUTERS/Jonathan Ernst
Supporters attend a rally with Republican U.S. presidential candidate Donald Trump in San Diego, California, U.S. May 27, 2016. REUTERS/Jonathan Ernst
Marcos Spence solicits volunteers to work for the campaign of Republican U.S. presidential candidate Donald Trump as they stand in line before the start of his rally in Albuquerque, New Mexico, U.S. May 24, 2016. REUTERS/Jonathan Ernst
A supporter holds a sign as Republican U.S. presidential candidate Donald Trump holds a rally in Anaheim, California, U.S. May 25, 2016. REUTERS/Jonathan Ernst
Supporters line up to enter a convention center where U.S. Republican presidential candidate Donald Trump holds a campaign rally in Anaheim, California, United States May 25, 2016. REUTERS/Mike Blake
Supporters of Republican U.S. Presidential candidate Donald Trump arrive before Trump speaks at a campaign event in Anaheim, California U.S. May 25, 2016. REUTERS/Mike Blake
A supporter of Republican U.S. Presidential candidate Donald Trump holds a sign before Trump speaks at a campaign event in Anaheim, California U.S. May 25, 2016. REUTERS/Mike Blake
Supporters of Republican U.S. Presidential candidate Donald Trump arrive before Trump speaks at a campaign event in Anaheim, California U.S. May 25, 2016. REUTERS/Mike Blake
Supporters of Republican U.S. presidential candidate Donald Trump stand in line before the start of his rally in Albuquerque, New Mexico, U.S. May 24, 2016. REUTERS/Jonathan Ernst FOR EDITORIAL USE ONLY. NO RESALES. NO ARCHIVES.
A supporter of Republican U.S. presidential candidate Donald Trump attends a Trump campaign rally at the Verizon Wireless Arena in Manchester, New Hampshire, February 8, 2016. REUTERS/Rick Wilking
A supporter of Republican U.S. presidential candidate Donald Trump wearing a "Trump for President '16" t-shirt listens to the candidate speak at a campaign rally at the airport in Hagerstown, Maryland, U.S. On April 24, 2016. REUTERS/Jim Bourg/File Photo
Activists of Hindu Sena, a Hindu right-wing group, perform a special prayer to ensure a victory of Republican U.S. presidential candidate Donald Trump in the upcoming elections, according to a media release, in New Delhi, India May 11, 2016. REUTERS/Anindito Mukherjee
Supporters hold signs as Republican U.S. presidential candidate Donald Trump speaks during a campaign rally in Lynden, Washington, U.S., May 7, 2016. REUTERS/Jim Urquhart
Supporters cheer as Republican U.S. presidential candidate Donald Trump speaks during a campaign rally in Lynden, Washington, U.S., May 7, 2016. REUTERS/Jim Urquhart
Supporters hold signs as Republican U.S. presidential candidate Donald Trump speaks during a campaign rally in Lynden, Washington, U.S., May 7, 2016. REUTERS/Jim Urquhart
A supporter of Republican presidential candidate Donald Trump holds a sign during a rally in Spokane, Wash., Saturday, May 7, 2016. (AP Photo/Ted S. Warren)
Delegate Douglas Marshall in the Donald Trump booth during the second day of the Republican Party of Texas state convention on May 13, 2016 in Dallas. (Paul Moseley/Fort Worth Star-Telegram/TNS via Getty Images)
Supporters look on as Republican presidential candidate Donald Trump speaks at a rally Saturday, May 7, 2016, in Lynden, Wash. (AP Photo/Elaine Thompson)
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
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
Republican U.S. presidential candidate Donald Trump supporters Josh (R), and his father Jeff Schimek (L), wait for him to speaks during a Town Hall at the Racine Civic Centre Memorial Hall April 2, 2016. REUTERS/Kamil Krzaczynski EDITORIAL USE ONLY. NO RESALES. NO ARCHIVE
Supporters (L) of Republican U.S. presidential candidate Donald Trump point and scream at an anti-Trump demonstrator (R) holding a sign reading "More Like Make America Racist Again" sign during a Trump campaign rally in Fountain Hills, Arizona March 19, 2016. REUTERS/Ricardo Arduengo TPX IMAGES OF THE DAY
A supporter of U.S. Republican presidential candidate Donald Trump attends a campaign rally in De Pere, Wisconsin, United States, March 30, 2016. REUTERS/Jim Young
Bob Bolus, a supporter of U.S. Republican presidential candidate Donald Trump, gives the thumbs up to drivers as they pass by on Super Tuesday in Middleburg Heights, Ohio March 15, 2016. REUTERS/Aaron Josefczyk
Rosemary Harder wears a hat supporting Republican U.S. presidential candidate Donald Trump during a news conference, after the Florida, Ohio, North Carolina, Illinois and Missouri primary elections, held at his Mar-A-Lago Club, in Palm Beach, Florida March 15, 2016. REUTERS/Joe Skipper
Supporter of U.S. Republican presidential candidate Donald Trump Alex Stypik joins Trump (L) on stage at a campaign rally in Bloomington, Illinois March 13, 2016. REUTERS/Jim Young
A Trump supporter (R) yells at a demonstrator (L) after Republican U.S. presidential candidate Donald Trump cancelled his rally at the University of Illinois at Chicago March 11, 2016. REUTERS/Kamil Krzaczynski TPX IMAGES OF THE DAY
Supporters of Republican U.S. presidential candidate Donald Trump cheer on their candidate at a Trump campaign rally in New Orleans, Louisiana March 4, 2016. REUTERS/Layne Murdoch Jr.
A supporter of U.S. Republican presidential candidate Donald Trump attends a campaign rally in Cadillac, Michigan, March 4, 2016. REUTERS/Jim Young
A supporter of Republican U.S. presidential candidate Donald Trump holds up a sign at a campaign rally at Valdosta State University in Valdosta, Georgia February 29, 2016. REUTERS/ Philip Sears
A supporter of Republican U.S. presidential candidate Donald Trump celebrates with a cigar at Trump's 2016 South Carolina presidential primary night rally in Spartanburg, South Carolina February 20, 2016. REUTERS/Jonathan Ernst
A campaign volunteer for U.S. Republican presidential candidate Donald Trump wears a hat signed by Trump during a rally with supporters in Gaffney, South Carolina February 18, 2016. REUTERS/Jonathan Ernst
Freda Green, of Louisiana, wears a hat in support of Republican U.S. presidential candidate Donald Trump before a rally in Baton Rouge, Louisiana February 11, 2016. REUTERS/Jonathan Bachman
A veteran of both the Korean and the Vietnam War, C.J. Dauzt wears a sticker in support of Republican U.S. presidential candidate Donald Trump before a rally in Baton Rouge, Louisiana in Baton Rouge, Louisiana February 11, 2016. REUTERS/Jonathan Bachman
10-year-old Ian Linden, of New Orleans, holds a sign in support of Republican U.S. presidential candidate Donald Trump before a rally in Baton Rouge, Louisiana February 11, 2016. REUTERS/Jonathan Bachman
Supporter of U.S. Republican presidential candidate Donald Trump wait for the start of his campaign rally in Plymouth, New Hampshire February 7, 2016. REUTERS/Jim Bourg
Anne-Sophie Marquis cradles her doll Clare, wearing a button supporting U.S. Republican presidential candidate Donald Trump, at a Trump campaign rally in Plymouth, New Hampshire February 7, 2016. REUTERS/Rick Wilking
Young supporters of Republican U.S. presidential candidate businessman Donald Trump wait for Trump to speak at a veteran's rally in Des Moines, Iowa January 28, 2016. REUTERS/Aaron P. Bernstein
Mark Palzer shows his support for U.S. Republican presidential candidate Donald Trump before a campaign rally at Oral Roberts University in Tulsa, Oklahoma January 20, 2016. REUTERS/Nick Oxford
Barbara Tomasino shows her support for U.S. Republican presidential candidate Donald Trump before a campaign rally at Oral Roberts University in Tulsa, Oklahoma, January 20, 2016. REUTERS/Nick Oxford
Supporters of U.S. Republican presidential candidate Donald Trump attend a campaign rally at Oral Roberts University in Tulsa, Oklahoma, January 20, 2016. REUTERS/Nick Oxford
Liberty University students and supporters of Republican presidential candidate Donald Trump wear letters spelling his name before his speech at Liberty University in Lynchburg, Virginia, January 18, 2016. REUTERS/Joshua Roberts
A supporter of U.S. Republican presidential candidate Donald Trump wears a National Rifle Association shirt before his speech at Liberty University in Lynchburg, Virginia, January 18, 2016. REUTERS/Joshua Roberts
Trump supporters Joshua Smith (from Left) and Seth Stephens, both of Aiken, South Carolina and Rona Bartolomucci of Hilton Head Island, wait along the front buffer before a rally for U.S. Republican presidential candidate Donald Trump at the Westin Hilton Head Island Resort and Spa in Hilton Head Island, South Carolina, December 30, 2015. REUTERS/Randall Hill
FOUNTAIN HILLS, AZ - MARCH 19: Supporters of Republican presidential candidate Donald Trump look on during Fountain Park during a campaign rally on March 19, 2016 in Fountain Hills, Arizona. Trumps visit to Arizona is the second time in three months as he looks to gain the GOP nomination for President. (Photo by Ralph Freso/Getty Images)
SALT LAKE CITY, UT - MARCH 18: A supporter waits for Republican presidential candidate Donald Trump speak at a campaign rally on March 18, 2016 in Salt Lake City, Utah. The Republican and Democratic caucuses are March 22. (Photo by George Frey/Getty Images)
A supporter of Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, wears campaign stickers on her sandals before a town hall event at the Tampa Convention Center in Tampa, Florida, U.S., on Monday, March 14, 2016. As protesters shadow campaign appearances by Trump, the billionaire has shifted a planned Monday-night rally in south Florida to Ohio, where polls show Governor John Kasich may be pulling ahead days before the states primary election. Photographer: Andrew Harrer/Bloomberg via Getty Images
Trump supporters pass out signs prior to a rally for Republican presidential candidate Donald Trump on March 13, 2016 in Boca Raton, Florida. Primary voters head to the polls on March 15th in Florida. / AFP / RHONA WISE (Photo credit should read RHONA WISE/AFP/Getty Images)
Attendees wait for the start of a campaign event with Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, not pictured, in Bloomington, Illinois, U.S., on Sunday, March 13, 2016. After violent protests prompted Donald Trump to cancel a rally in Chicago on Friday night, the Republican presidential front-runner blamed the activist group MoveOn.Org and supporters of Senator Bernie Sanders for the chaos, while defending his own harassed supporters. Photographer: Daniel Acker/Bloomberg via Getty Images
Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, left, stands with a man he called onto the stage from the crowd because of the 'Legal Immigrant For Trump' t-shirt he was wearing, during a campaign event in Bloomington, Illinois, U.S., on Sunday, March 13, 2016. After violent protests prompted Donald Trump to cancel a rally in Chicago on Friday night, the Republican presidential front-runner blamed the activist group MoveOn.Org and supporters of Senator Bernie Sanders for the chaos, while defending his own harassed supporters. Photographer: Daniel Acker/Bloomberg via Getty Images
CHICAGO, IL - MARCH 11: A supporter exists the University of Illinois at Chicago Pavilion where Republican presidential candidate Donald Trump cancelled a campaign rally over safety concerns March 11, 2016 in Chicago, Illinois. The Illinois Republican presidential primary will be held March 15. (Photo by Jonathan Gibby/Getty Images)
Supporters of Republican Presidential candidate Donald Trump gather prior to a Trump Rally at the Peabody Opera House on March 11, 2016 in St. Louis, Missouri. / AFP / Michael B. Thomas (Photo credit should read MICHAEL B. THOMAS/AFP/Getty Images)
Supporters of Republican Presidential candidate Donald Trump gather prior to a Trump Rally at the Peabody Opera House on March 11, 2016 in St. Louis, Missouri. / AFP / Michael B. Thomas (Photo credit should read MICHAEL B. THOMAS/AFP/Getty Images)
RADFORD, VA - FEBRUARY 29: A campaign rally for Donald J. Trump, candidate for the Republican presidential nomination, at the Radford University Dedmon Arena in Radford, Virginia, on Monday, February 29, 2016. (Photo by Benjamin Lowy/Getty Images Reportage)
A woman reacts as U.S. Republican presidential candidate Donald Trump works the crowd following a campaign event in an airplane hanger in Rome, New York April 12, 2016. REUTERS/Carlo Allegri
A woman reacts as U.S. Republican presidential candidate Donald Trump works the crowd following a campaign event in an airplane hanger in Rome, New York April 12, 2016. REUTERS/Carlo Allegri
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Romney added that if either drops out after Tuesday's New York primary, then he thinks Trump would not hit the needed 1,237 delegates to win the nomination. Instead, Republicans would enter into a contested convention.

He did not suggest who, between Cruz and Kasich, he believed should drop out of the race. Romney said last month that he was voting for Cruz in the Utah caucuses, which Cruz ended up winning, but said his encouragement was not an endorsement.

Romney made robo-calls for Kasich and campaigned for him ahead of the March 15 Ohio primary, which was the only contest Kasich won.

SEE ALSO: Clinton and Trump poised for New York victories, but Sanders is rising

Since early March, Romney has been a leading figure in the anti-Trump movement, and the pair have engaged in a vicious back and forth that has cooled down only recently.

The former Massachusetts governor also opined on the rules the Republican Party has for the delegate-selection process — one that Trump has called "rigged" and "crooked" — as pro-Cruz delegates have been chosen across the country to spots that are committed to Trump on the initial ballot.

"Well, actually at this stage of course the rules are the rules, and the party put them out there well over a year ago," Romney said. "And they're very similar to the rules that existed at the time when I was running four years ago."

"By the way, there's probably nothing wrong with making it difficult," he continued. "After all, these rules are a lot simpler than the rules of foreign affairs, for instance, or the rules of our economy. And if you want to be president, you're going to have to deal with rules far more complicated than Republican delegate rules."

Listen to the preview of Gregory's interview with Romney below:

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