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In his Talking Points Memo tonight, Bill O'Reilly said that one of the first challenges President-elect Donald Trump will have to face is what to do about sanctuary cities.

O'Reilly explained that mayors of sanctuary cities across the country - including Chicago Mayor Rahm Emanuel, Seattle Mayor Ed Murray and New York City Mayor Bill de Blasio - have declared that they will not stop their sanctuary policies.

"By refusing to obey federal immigration law, the politicians are basically saying, 'We want open borders,'" O'Reilly said.

"Anyone who gets into America illegally has a place where they can go with no repercussions," O'Reilly said. "These mayors - all uber-liberals - believe they will harvest more votes by showing phony compassion than by promoting public safety and fighting anarchy."

O'Reilly acknowledged that most immigrants are peaceful, law-abiding people, but he pointed out there's simply no way to tell the good from the bad with these current sanctuary policies.

"It comes down to what Donald Trump will do to the mayors and counties that defy him on immigration law. [He] has to do something, and we expect the showdown will develop quickly early next year."

Watch the full Talking Points Memo above.

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