President Trump has always solicited information from dubious sources. But now, in his second term, he has fewer people around him who try to keep those voices away.

© Federico Rios for The New York Times

In its first military action, the Trump administration showed itself to be reckless and unserious.

Reports that the defense secretary shared sensitive information on an unclassified messaging app are straining the limits of his credibility.

They may be even more serious than the one we’ve been focused on.

Trust your staff, admit mistakes, don’t embarrass the president.

A national security scandal is manageable. A bunker mentality spells doom.

There’s a reason every warrior society has a code.

In Trump world, the rules apply only to other people.

If there’s no real accountability for the Signal breach or even an admission of the actual problem, there’s no indication it won’t happen again.

Readers react to the security lapse that allowed the editor of The Atlantic into a group chat about a U.S. military operation in Yemen.

Help yourself. The door is open.

What members of the administration can no longer effectively do is pretend that their incompetent and reckless actions didn’t happen. It’s right there on the page.

And why the careless secretary of defense should resign.

A defense secretary intentionally using a civilian app to share sensitive war plans without noticing a journalist was in the chat would be egregious.