President Donald Trump is defending his travel ban. He says it should be “tougher and more specific.”

On Twitter Friday Trump says: “The travel ban into the United States should be far larger, tougher and more specific-but stupidly, that would not be politically correct!”

Trump made the comment after tweeting about a reported explosion and fire on a subway train in London that police say was a terrorist incident.

The ban affects travelers from six mostly Muslim nations and refugees anywhere in the world.

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