Intelligence officials acknowledge the sensitivity of the military strike information.

Under questioning from senators, the C.I.A. chief and the director of national intelligence pointed to the defense secretary to determine what was appropriate to share.

Trump Downplays Signal Leak, Backing Waltz and Pointing Finger at Journalist

Democrats denounced the country’s top intelligence officials for “sloppy, careless, incompetent behavior” for discussing secret military plans in a group chat.

Republicans in Congress React to Signal Chat Leak With Collective Shrug

A few G.O.P. lawmakers said they would look into the breach, but party leaders largely tempered their criticism of the Trump administration.

Hegseth Disclosed Secret War Plans in a Group Chat

The conversation among the defense secretary and other national security officials on a commercial messaging app mistakenly included the editor in chief of The Atlantic, Jeffrey Goldberg.