Axios article on Tom Bossert resignation – Bolton cleaning house.

Tom Bossert, White House homeland security advisor, is resigning, the White House confirmed Tuesday.

Background, per Axios' Jonathan Swan: Senior staff were initially worried about former National Security Advisor Mike Flynn, and thought somebody was needed to "keep an eye on him." Bossert was partly brought in to fulfill that role, and focused more on domestic terrorist threats. But it never worked out that way, as Flynn was gone in a matter of weeks. Then General H.R. McMaster came in and essentially pushed that part of his job aside. He had a very important role on natural disasters, but very different than what he was brought in to do.

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Bossert also didn't have much of a relationship with the president until the hurricanes, when he briefed Trump on those. Trump thought he did a good job and thought that for the most part he was pretty good on TV, but Bossert wasn't a guy who spent a lot of time with Trump in the Oval Office.

A source who's worked with Bossert in the White House tells Swan: "His primary role ended up being the point person responding to the natural disasters, of which there were many. He invested a lot of time, effort and energy in that.

"[W]hen McMaster came in he essentially took away [Bossert's] counter-terrorism portfolio. He never lost the title but in reality he was frustrated with the fact that whole half of his portfolio got taken away."

Bossert also tried to lead efforts on cyber security, which never fully came to fruition. A huge interagency process, lots of reasons for the hiccups. A lot of work has been done but it's never been completed.

White House statement: “The President is grateful for Tom’s commitment to the safety and security of our great country," said Press Secretary Sarah Sanders. "President Trump thanks him for his patriotic service and wishes him well.”