Republican primary front-runner Donald TrumpDonald John TrumpTrump campaign buys full page ads in Miami newspapers ahead of Dem debates Trump administration's 'forced diplomacy' with Iran isn't working Roy Moore trails Republican field in Alabama MORE on Sunday said he’s “not sure” whether primary rival Marco RubioMarco Antonio RubioGOP lays debate trap for 2020 Democrats Mellman: Are primary debates different? Overnight Health Care — Sponsored by Campaign for Tobacco-Free Kids — Trump issues order to bring transparency to health care prices | Fight over billions in ObamaCare payments heads to Supreme Court 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 CruzGOP lays debate trap for 2020 Democrats O'Rourke on Senate bid backer Beyoncé: I will have to 'earn her support' for 2020 Hickenlooper, Bennet bring deep ties to 2020 debate stage MORE, who was born in Canada to an American mother.