Top-secret codeword information derived from an ally is even more sensitive.

To a remarkable degree, the United States relies on liaison relationships with other powers with whom it shares information. If Trump has indeed compromised a source of information, it is not merely a betrayal of an ally’s trust: It is an act that will jeopardize a whole range of relationships. After all, the Director of Central Intelligence cannot very well say, “Don’t worry, we won’t share that with the president.” So now everybody—even our closest allies like the United Kingdom—would be well-advised to be careful with what they share with us. That is a potential intelligence debacle for us, but the danger goes beyond that. If any foreign government harbored lingering illusions about the administration’s ability to protect any information, including sensitive but non-intelligence matters like future foreign-policy initiatives or military deployments, they no longer do. They will be even more apprehensive about sharing sensitive information of any kind because…

He gave it to the Russians. In the Oval Office. In a fit of braggadocio.

Russia is antagonistic to the United States, although Trump has repeatedly indicated his desire to be chummy with the Russians—after all, as he notoriously said during the presidential campaign, we are both killers, and so on the same moral plane. He apparently divulged the information to show off, which not only shows a lack of self-discipline: It shows, yet again, how easy this man is to play, particularly by veteran manipulators like his two experienced, talented, and thuggish guests. The crisis is made worse by virtue of Trump having just fired the FBI director, apparently for having pushed that Russia investigation too far.

Quite apart from making himself and the country a laughingstock around the world, the president has now practically begged Vladimir Putin to toy with him, tantalize him, tease him, flatter him, manipulate him. He has shown the Russians (and others, who are watching just as closely) just how easy that is to do, and he has shown the rest of us that his vanity and impulsiveness have not been tempered by the highest responsibilities.

The corruption has begun.

In the wake of the Post story, the White House—hoping, presumably, to avoid another Comey-firing publicity debacle—trotted out three reasonably sane, responsible, experienced adults to vouch for the President’s story. Secretary of State Rex Tillerson, Deputy National Security Adviser Dina Powell, and National Security Adviser Lieutenant General H. R. McMaster made public statements calling the story false, giving different variants of this argument: The President did not disclose sources and methods for intelligence gathering, or future military operations.

Well, of course not. That is not what the Post said in its story: It said that he divulged intelligence. And since it seems likely that the Russians captured all of the conversation—they were allowed to bring their electronics into the room, including the only video cameras, the American press having been excluded—they undoubtedly got all of it. And you bet that their analysts are even now chuckling as they figure out what the sources were.