The national security adviser is a top aide to the president who plays a major role in foreign and national security policy decision-making.

President-elect Donald Trump has asked Florida Republican Rep. Mike Waltz to be his national security adviser, multiple sources told ABC News.

WASHINGTON—President-elect Donald Trump is expected to nominate Sen. Marco Rubio of Florida as secretary of state and has asked Rep. Mike Waltz, a Green Beret veteran, to be his White House ...

As national security adviser, the Florida congressman will play a key role in shaping U.S. policy on geopolitical conflicts ranging from the war in Ukraine to the war between Israel and Hamas in Gaza.

President Donald Trump ousted Mike Waltz, who has lost the confidence of other administration officials, from his national security adviser position on Thursday.

Trump picks Rep. Mike Waltz, a former Green Beret, as national security adviser The Florida congressman emerged as a vocal Biden critic during Trump's campaign.

Trump’s pick comes just hours after he decided to name Waltz, a fellow tough-on-China lawmaker, as national security adviser.

President-elect Trump has chosen Rep. Michael Waltz (R-Fla.) to serve as his national security adviser, tapping the former Green Beret to fill a top White House post, multiple sources confirmed to … ...

President Donald Trump ousted Mike Waltz, who has lost the confidence of other administration officials, from his national security adviser position on Thursday.

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.