Trump: 'I have standing' to sue Cruz over citizenship
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Republican presidential hopeful Donald TrumpDonald John Trump2020 Democrats spar over socialism ahead of first debate Senate passes .5 billion border bill, setting up fight with House 'Teflon Don' avoids the scorn of the 'family values' GOP — again MORE on Thursday threatened to bring a lawsuit challenging rival Ted CruzRafael (Ted) Edward CruzWhite House to convene social media summit after new Trump attacks GOP lays debate trap for 2020 Democrats O'Rourke on Senate bid backer Beyoncé: I will have to 'earn her support' for 2020 MORE’s eligibility to serve as president — unless the Texas senator “clean[s] up his act.”

“If [Ted Cruz] doesn’t clean up his act, stop cheating, & doing negative ads, I have standing to sue him for not being a natural born citizen,” Trump said in a tweet

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Trump promised at a January GOP presidential debate not to sue Cruz over the issue.

“I’m not bringing a lawsuit,” he said. “I promise. But the Democrats are going to bring a lawsuit.”

The billionaire businessman’s comments come after several of his supporters filed a federal lawsuit challenging the constitutionality of Cruz’s presidential run.

Cruz, a constitutional lawyer and former Texas solicitor general, has maintained that he is eligible to be president, noting the distinction between naturalized and natural-born citizen.

He was born in Canada to an American mother and Cuban father.

Article II, Section 1 of the Constitution states “no person except a natural born citizen, or a citizen of the United States, at the time of the adoption of this Constitution, shall be eligible to the office of president.”