Sen. Jeff Flake (R-Ariz.) is calling on presumptive Republican presidential nominee Donald Trump to soften his position on Muslims, saying a ban is "unconstitutional."

"He's got to soften his position there," Flake said on NBC's "Meet the Press" Sunday. "I mean, a total and complete ban on Muslims — that is a religious test that is certainly against the Constitution.

"And it is the last thing we should do if we want to win a war on terrorism," Flake said. "So it's constitutionally wrong, and also, strategically, it's just not a smart thing to do."

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