Former White House chief strategist Stephen Bannon said there was "zero" chance that President TrumpDonald John TrumpTrumps light 97th annual National Christmas Tree Trump to hold campaign rally in Michigan 'Don't mess with Mama': Pelosi's daughter tweets support following press conference comments MORE was not aware of a controversial 2016 meeting at Trump Tower between one of his sons and a Russian lawyer, according to a new book. 

According to MSNBC, which tweeted an excerpt from Michael Wolff's upcoming book, "Fire and Fury: Inside the Trump White House," Bannon said that it was likely Donald Trump Jr.Donald (Don) John TrumpWhite House calls Democratic witness's mentioning of president's youngest son 'classless' Lawmakers to watch during Wednesday's impeachment hearing Top Democrats knock Trump on World AIDS Day MORE took lawyer Natalia Veselnitskaya and others up to his father's office during the meeting.

“The chance that Don. Jr did not walk these Jumos up to his father’s office on the 26th floor is zero," the excerpt reads.

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Bannon, who joined Trump's campaign as chairman a couple months after the June 2016 meeting, was fired from the White House in August 2017. He's since retaken his post at the head of Breitbart News.

The suggestion that Trump was aware of the meeting that his son and other campaign officials fielded with Veselnitskaya, who reportedly has ties to the Russian government, contradicts statements from White House officials, who have claimed that the president was not told about the meeting.

Trump Jr. agreed to attend the meeting after an intermediary told him that Veselnitskaya had promised damaging information on then-Democratic presidential candidate Hillary ClintonHillary Diane Rodham ClintonTrump to hold campaign rally in Michigan Saagar Enjeti ponders Hillary Clinton's 2020 plans Political ad spending set to explode in 2020 MORE. He has said that, instead, the lawyer discussed American adoptions of Russian children.

Former campaign chairman Paul ManafortPaul John ManafortGiuliani meets with fired Ukrainian prosecutor who pushed Biden, 2016 claims: report Top State Department official tells senators he has not seen evidence of Ukrainian interference Justice Dept releases another round of summaries from Mueller probe MORE and Trump's son-in-law Jared KushnerJared Corey KushnerDemocrat calls for investigation of possible 'inappropriate influence' by Trump in border wall contract Judge temporarily halts construction of a private border wall in Texas Mueller witness linked to Trump charged in scheme to illegally funnel money to Clinton campaign MORE also attended the June 2016 meeting.

Possible ties between the Trump campaign and the Russian government are the subject of a criminal investigation by special counsel Robert MuellerRobert (Bob) Swan MuellerTrump says he'll release financial records before election, knocks Dems' efforts House impeachment hearings: The witch hunt continues Speier says impeachment inquiry shows 'very strong case of bribery' by Trump MORE, who is also looking into wider Russian meddling in the 2016 election. 

So far, Manafort and one of his associates, Richard Gates, have been indicted as a result of that investigation. They are facing charges of money laundering and tax evasion, among other allegations. 

Former national security adviser Michael Flynn and George PapadopoulosGeorge Demetrios PapadopoulosFeinstein endorses Christy Smith for Katie Hill's former House seat What if impeachment fails? Democrat seeking Katie Hill's former seat nabs endorsement from firefighters association MORE, a former foreign policy adviser to Trump's campaign, have pleaded guilty to lying to the FBI about their contacts with Russian representatives.