Michael Waltz, who US media reports has just left his post, was Donald Trump’s national security adviser. He was among Trump’s first appointments after his election.

Before the White House role, he was a congressman from Florida’s sixth congressional district from 2019 until he resigned in January to take up the new job with Trump.
In Congress, he served on the Intelligence, Armed Services and Foreign Affairs committees.
He was previously an officer in the US Army and National Guard, retiring after 27 years with the rank of colonel.
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Walz struck me as more of a yes-man than a national security advisor.
So what? Another gofer will take his place who is grossly incompetent.