Former White House chief strategist Stephen Bannon said there was "zero" chance that President TrumpDonald TrumpFreedom Caucus member condemns GOP group pushing 'Anglo-Saxon political traditions' MyPillow CEO Mike Lindell's new free speech site to ban certain curse words Secret Facebook groups of special operations officers include racist comments, QAnon posts: report 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.Don TrumpTrump Jr. shares edited video showing father knocking Biden down with golf ball Trump: 'I can't imagine' any Republican would beat me in 2024 primary if I run Trump Jr.: There are 'plenty' of GOP incumbents who should be challenged 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 ClintonPelosi on power in DC: 'You have to seize it' Cuba readies for life without Castro Chelsea Clinton: Pics of Trump getting vaccinated would help him 'claim credit' MORE. He has said that, instead, the lawyer discussed American adoptions of Russian children.

Former campaign chairman Paul ManafortPaul John ManafortTreasury: Manafort associate passed 'sensitive' campaign data to Russian intelligence Hunter Biden blasts Trump in new book: 'A vile man with a vile mission' Prosecutors drop effort to seize three Manafort properties after Trump pardon MORE and Trump's son-in-law Jared KushnerJared Corey KushnerTrump alumni launch America First Policy Institute Fauci fatigue sets in as top doc sows doubt in vaccine effectiveness The Memo: Biden's five biggest foreign policy challenges 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) MuellerWhy a special counsel is guaranteed if Biden chooses Yates, Cuomo or Jones as AG Barr taps attorney investigating Russia probe origins as special counsel CNN's Toobin warns McCabe is in 'perilous condition' with emboldened 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 PapadopoulosTrump supporters show up to DC for election protest Trump pardons draw criticism for benefiting political allies Klobuchar: Trump 'trying to burn this country down on his way out' MORE, a former foreign policy adviser to Trump's campaign, have pleaded guilty to lying to the FBI about their contacts with Russian representatives.