He has stepped down, but that nearly certainly means he was allowed to do so rather than be forcibly removed by Rebekah Mercer and the Breitbart family that own and control the site.
Between Bannon raising the word "treasonous" around that now infamous meeting with Russians at Trump Tower, and reports of him effectively ridiculing his boss in that new book "Fire and Fury", the bro-fest between them is over.
His departure from Breitbart threatens to further isolate the self-proclaimed champion of anti-Washington populism that swept Trump to power and whom Bloomberg once called "the most risky political operative in America". Ding dong the ding dong is dead.
The committee is investigating Russian interference in the 2016 presidential election as well as allegations of collusion between members of the Trump campaign and Russian officials. Bannon's departure was forced by his onetime financial patron, Rebekah Mercer.
Mr Bannon eventually left his post at the White House in August, saying at the time that he was planning on waging "war" with the Republic establishment form his post at Breitbart.
Mr Bannon said he was "proud of what the Breitbart team has accomplished in so short a period of time in building out a world-class news platform".
Then Mr Bannon placed a bad bet on Mr Roy Moore in the Senate race in Alabama, denting the perception that he could influence or even read a red-state electorate.
After the book's publication, Bannon expressed regret about his statements, saying said his criticism was aimed at Paul Manafort, Trump's former campaign chairman who also attended the meeting.
President Trump perplexed political pundits when he boasted Thursday that he has "a very good relationship" with North Korean dictator Kim Jong Un, while in the same breath deriding his former right hand man Stephen Bannon as a traitor.
"I feel betrayed because you're not supposed to do that", Trump told the Journal.
"Steve Bannon has nothing to do with me or my Presidency".