Two weeks after President Trump claimed, bizarrely, that the Obama administration had wiretapped his campaign, his press secretary suggested that GCHQ — Britain’s counterpart to the National Security Agency — had done the imaginary bugging. British officials were outraged. And soon the British press was reporting that the Trump administration had apologized.

But no: Meeting with the chancellor of Germany, another ally he’s alienating, Mr. Trump insisted that there was nothing to apologize for. He said, “All we did was quote a certain very talented legal mind,” a commentator on (of course) Fox News.

Was anyone surprised? This administration operates under the doctrine of Trumpal infallibility: Nothing the president says is wrong, whether it’s his false claim that he won the popular vote or his assertion that the historically low murder rate is at a record high. No error is ever admitted. And there is never anything to apologize for.

O.K., at this point it’s not news that the commander in chief of the world’s most powerful military is a man you wouldn’t trust to park your car or feed your cat. Thanks, Comey. But Mr. Trump’s pathological inability to accept responsibility is just the culmination of a trend. American politics — at least on one side of the aisle — is suffering from an epidemic of infallibility, of powerful people who never, ever admit to making a mistake.