Controversial White House chief strategist Steve Bannon is leaving his White House post.

“White House Chief of Staff John Kelly and Steve Bannon have mutually agreed today would be Steve’s last day. We are grateful for his service and wish him the best,” according to a statement from the White House press office.

Bannon was a key adviser to President Donald Trump’s general election campaign and has been a forceful but contentious presence in a divided White House.

The former leader of conservative Breitbart News pushed Trump to follow through with his campaign promises. But he’s also sparred with some of Trump’s closest advisers, including son-in-law Jared Kushner.