So far, he hasn't.

That's why, in a short photo op on Friday at the White House, reporters pressed him for that evidence. In the video above, you can hear ABC's Jonathan Karl repeatedly, and bluntly, asking Trump if he had any evidence at all to support his accusations. And other reporters shouted questions about former national security adviser Michael Flynn and his ties to Turkey.

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But handlers and security officers quickly began to usher the press out of the room, using a phrase — “thank you, press” — that seems polite, but really means, “It's time to stop asking questions and leave.”

Trump ignored the questions, then shared a joke with Rep. Greg Walden (R-Ore.).