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On Special Report tonight, Judge Andrew Napolitano reacted to the back-and-forth between Donald Trump and Pope Francis.

After acknowledging that he's a practicing, traditionalist Roman Catholic, Judge Napolitano said that he thinks the pope should not weigh in on American politics.

"The pope likes to opine in areas outside his expertise, as far away from Catholicism as economics, as the environment and now American domestic politics," Judge Napolitano explained. "I think he should stay out of it."

He added the pope is entitled to a political opinion, and personally he happens to disagree with Trump on several of his proposals, including building a wall along the U.S.-Mexico border and the mass deportation of illegal immigrants.

"But when the pope gives a political opinion, there's this imprimatur, no pun intended, on what he says," Judge Napolitano said. "He didn't become the pope to lead Catholics to vote for or against an American politician."

Watch more above.

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