Story highlights Republican presidential front-runner Donald Trump is raising questions about Republican rival Ted Cruz's electability

Trump called a "very precarious" problem

Claremont, New Hampshire (CNN) Republican presidential front-runner Donald Trump is raising questions about Republican rival Ted Cruz's electability in light of the Texas senator's birth in Canada, which Trump called a "very precarious" problem.

Trump said in an interview with The Washington Post that Republican voters should think twice before voting for Cruz, who could face challenges to his eligibility to serve as president given that he was born in Canada, and not the United States.

"Republicans are going to have to ask themselves the question: 'Do we want a candidate who could be tied up in court for two years?' That'd be a big problem," Trump said in the interview. "It'd be a very precarious one for Republicans because he'd be running and the courts may take a long time to make decision. You don't want to be running and have that kind of thing over your head."

Trump added that he'd "hate to see something like that get in his (Cruz's) way" and noted that "a lot of people are talking about it."

The U.S. Constitution requires the president be a "natural-born citizen."

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