After days of silence amid withering criticism from his former colleagues and his largest benefactor, Bannon tried to make amends.
The June 2016 meeting, in which Donald Jr. and other Trump campaign staff met with Russian lawyer Natalya Veselnitskaya, provided evidence of an attempt by the campaign to seek out damaging information on Hillary Clinton from Russian sources.
Less than a year ago, Time magazine put Mr Stephen Bannon on its cover and wondered whether he might be the second most powerful man in the world.
Republican strategist Cheri Jacobus speculated on Thursday that Bannon was planning to crush Trump in the Russian Federation probe after the president was instrumental in getting Bannon fired from Breitbart and his Sirius XM radio program, as well as convincing the wealthy Mercer family to stop funding Bannon's campaigns. He issued a statement Sunday praising the president's eldest son, Donald Trump Jr., whom he was quoted accusing of treasonous behavior in the book. He stepped down from the company Tuesday, under pressure.
Bannon's departure from Breitbart came as a shock to some of his allies.
Beyond revealing the breakup itself, Mr. Wolff's book provides a stinging insight into what some White House insiders thought of the president.
Donald Trump. Thomson Reuters
"I'm not saying I have or haven't", Trump said.
Also, a former deputy chief of staff, Katie Walsh, is quoted as saying that trying to deal with the president was "like trying to figure out what a child wants" - an observation she later denied having made.
According to findings released Wednesday, only 19 percent of GOP voters said they had a favorable view of the former White House chief strategist, a 13-percent drop in favorability from a little less than a month prior, when 32 percent registered approval of him.
Another possible avenue for Mr Bannon already is closed. After the win, he accompanied Mr. Trump to the White House and became his chief strategist.
US President Donald Trump walks to Marine One before leaving the White House on January 5, 2018.
Trump said "we'll see what happens" when asked if he'd provide an interview to Mueller's team.
Mexico private sector says open to talks on NAFTA auto rules
In any case, Trump may have trouble persuading Congress to scrap the treaty, which could be required under US law. Mexico also has reached out to China to compensate for any loss of investment from the United States.