Republican primary front-runner Donald TrumpDonald John TrumpCensus Bureau intends to wrap up count on Oct. 5 despite judge's order Top House Republican calls for probe of source of NYT Trump tax documents New Yorkers report receiving ballots with wrong name, voter addresses MORE on Sunday said he’s “not sure” whether primary rival Marco RubioMarco Antonio RubioGOP online donor platform offering supporters 'Notorious A.C.B.' shirts Sunday shows preview: Lawmakers prepare for SCOTUS confirmation hearings before election GOP lawmakers distance themselves from Trump comments on transfer of power MORE can run for president.

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Trump on Saturday retweeted a follower who said the Florida senator, who was born in Florida to Cuban parents, is not eligible to run for higher office.

“I think the lawyers have to determine it,” Trump said on ABC’s “This Week,” when asked if he believed the tweet. “It was a retweet. Not so much with Marco, I’m not really that familiar with Marco’s circumstance.”

When pressed on why he retweeted the claim if he wasn’t sure about it, Trump said he was trying to “start dialogue” about the issue.

“Uh, because I’m not sure,” he said. “I mean, let people make their own determination.”

“Somebody said he’s not, and I retweeted it,” he added. “I have 14 million people between Twitter and Facebook and Instagram, and I retweet things and we start dialogue and it’s very interesting.”

Trump has also questioned the eligibility of primary rival Ted CruzRafael (Ted) Edward CruzSupreme Court fight should drive Democrats and help Biden Fears grow of chaotic election Senate GOP set to vote on Trump's Supreme Court pick before election MORE, who was born in Canada to an American mother.