National security adviser Mike Waltz is leaving his post and will become America’s ambassador to the United Nations, marking the first major shakeup of President Trump’s second administration.

President Donald Trump has nominated former national security adviser Mike Waltz to now serve as the U.S. ambassador to the United Nations. The move comes just hours after news broke that Waltz ...

Trump said he would make Secretary of State Marco Rubio his interim national security adviser. It's the first time since the Nixon era that one person will do both jobs.

Although Waltz has retained a role in the administration, his ouster as national security adviser makes him the first high-ranking official to depart a post since Trump's Jan. 20 inauguration.

President Donald Trump has named Mike Waltz as his next nominee for the U.S. ambassador to the UN after ousting him as his national security adviser.

WASHINGTON — President Donald Trump said Thursday he's nominating his national security adviser Mike Waltz to serve as United Nations ambassador in a major shake-up of his national security team ...

WASHINGTON (AP) — President Donald Trump said Thursday that he is nominating national security adviser Mike Waltz as United Nations ambassador while Secretary of State Marco Rubio would take ...

Donald Trump Appoints Mike Waltz as U.N. Ambassador After Removing Him as National Security Adviser Secretary of State Marco Rubio will now serve as the interim national security adviser after ...