"If there's any confusion out there, let me clear it up: I'm leaving the White House and going to war for Trump against his opponents -- on Capitol Hill, in the media, and in corporate America," Bannon told Bloomberg on Friday.

The outgoing White House chief strategist spent just over a year formally working for the president. On Friday, his job with Trump came to an end.

STEVE BANNON OUT AT THE WHITE HOUSE

"White House Chief of Staff John Kelly and Steve Bannon have mutually agreed today would be Steve's last day," White House Press Secretary Sarah Sanders said. "We are grateful for his service and wish him the best."

Breitbart announced Friday that Bannon returned as executive chairman of the populist news site he once ran that rails against the political establishment in both parties. He chaired its evening editorial meeting Friday, the site said.

"The populist-nationalist movement got a lot stronger today," said Breitbart News Editor-in-Chief Alex Marlow. "Breitbart gained an executive chairman with his finger on the pulse of the Trump agenda."