Read a line-by-line analysis of the war plans shared over a Signal group chat, with additional reporting and context from CNN national security reporters.

"At this time, the message thread that was reported appears to be authentic, and we are reviewing how an inadvertent number was added to the chain," the NSC said.

A U.S. judge on Thursday ordered President Donald Trump's administration to preserve messages sent on the Signal messaging app discussing attack plans against the Houthis in Yemen that became public after they were inadvertently shared with a journalist.