Republican primary front-runner Donald TrumpDonald John TrumpIvanka Trump pens op-ed on kindergartners learning tech Bharara, Yates tamp down expectations Mueller will bring criminal charges Overnight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open MORE on Sunday said he’s “not sure” whether primary rival Marco RubioMarco Antonio RubioOvernight Defense: Tillerson, Trump deny report of rift | Tillerson says he never considered resigning | Trump expresses 'total confidence' in secretary | Rubio asks Army to kick out West Point grad Rubio asks Army to kick out West Point grad with pro-communist posts GOP establishment doubts Bannon’s primary powers 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 CruzWhatever you think the Alabama special election means, you’re probably wrong This week: Congress gets ball rolling on tax reform Week ahead: Senators work toward deal to fix ObamaCare markets MORE, who was born in Canada to an American mother.