Critics of President Trump's order halting travel from seven Muslim-majority countries need to recognize the flaws in the United States's immigration system before they challenge the president's action, Sen. Rand Paul (R-Ky.) said Tuesday.

"People ought to step back and see if we can agree that there's a problem in order to decide whether we like the solution," Paul said during an appearance on MSNBC.

"And the problem is pretty clear that about 40 percent of people who come visit our country on a visa overstay their visa, and we have no idea where they are."

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