National security adviser Mike Waltz, major figure in Signal scandal, expected to depart his post

President Donald Trump said Thursday that he would nominate outgoing national security adviser Mike Waltz to be the U.S. ambassador to the United Nations.

President Donald Trump said Thursday that he would nominate outgoing national security adviser Mike Waltz to be the U.S. ambassador to the United Nations.

“From his time in uniform on the battlefield, in Congress and, as my National Security Advisor, Mike Waltz has worked hard to put our Nation’s Interests first. I know he will do the same in his new role,” Trump said on Truth Social. He said Secretary of State Marco Rubio would act as "interim" national security adviser.

“I’m deeply honored to continue my service to President Trump and our great nation,” Waltz said on X after Trump’s announcement.

Waltz, a former congressman from Florida, has been on shaky ground with Trump since March after he inadvertently added a journalist to a private chat on the messaging app Signal with other top national security officials to discuss military strikes in Yemen. Three sources with knowledge of the situation had said earlier Thursday that Waltz and deputy national security adviser Alex Wong were expected to leave the administration.

White House officials declined to comment when they were asked about the expected departures.