Republican primary front-runner Donald TrumpDonald TrumpChaffetz: Threats against lawmakers should be taken seriously Warren cautions Dems against infighting CIA director: Leaks 'seem to be on the increase' MORE on Sunday said he’s “not sure” whether primary rival Marco RubioMarco RubioWill Republicans stand up to the NRA's insurrection rhetoric? The Hill's Whip List: Senate ObamaCare repeal bill Ivanka Trump turns to House GOP on paid family leave 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 CruzTed CruzGOP at decisive moment on Planned Parenthood Trump: ‘I cannot imagine’ GOP senators don’t back healthcare bill Trump making calls to senators on healthcare bill MORE, who was born in Canada to an American mother.