What led to Mike Waltz's ouster as Trump's national security adviser?

United States President Donald Trump on Thursday removed Mike Waltz as national security adviser (NSA), a key policy-shaping role, and tapped Secretary of State Marco Rubio to take over the role in the interim.

Trump announced that he was nominating Waltz to be the next US ambassador to the United Nations. “Mike Waltz has worked hard to put our Nation’s Interests first. I know he will do the same in his new role,” he posted on his Truth Social platform.

“I’m deeply honored to continue my service to President Trump and our great nation,” Waltz posted on X Thursday.

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