Washington (CNN) Donald Trump said Tuesday that he doesn't think people born in the U.S. to undocumented immigrants are American citizens.

"I don't think they have American citizenship and if you speak to some very, very good lawyers -- and I know some will disagree -- but many of them agree with me and you're going to find they do not have American citizenship. We have to start a process where we take back our country. Our country is going to hell," the Republican presidential front-runner said Tuesday night in an interview on Fox News.

Trump added he would "test it out" in the courts.

Trump has called for the deportation of all undocumented immigrants living in the United States -- allowing the "good ones" to return through an expedited legal process.

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