“Everybody in politics lies,” Hollywood mogul David Geffen once said of Bill and Hillary Clinton. “But they do it with such ease, it’s troubling.”

Geffen had a point — but he had not yet seen President Trump in action. With apologies to Lin-Manuel Miranda, when it comes to lying, the man is nonstop.

On June 1, just less than 500 days into the president’s term, The Post had counted 3,251 false or misleading claims by the commander in chief. Trump continued that dizzying pace during Thursday’s NATO news conference, and then launched his visit to Britain by trashing that country’s prime minister and brazenly lying about it a few hours later.

“I didn’t criticize the prime minister,” Trump said, shortly after criticizing the prime minister. He blasted Theresa May’s handling of Brexit and declared that her fiercest political rival, Boris Johnson, “would be a great prime minister.” Hours later, Trump dismissed the reprinting of his own words as “fake news,” even though the Rupert Murdoch-run Sun tabloid had his attacks on tape.