Former White House chief strategist Stephen Bannon said there was "zero" chance that President TrumpDonald John TrumpTrump: 'I don't trust everybody in the White House' JPMorgan CEO withdraws from Saudi conference Trump defends family separations at border 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 TrumpCollusion judgment looms for key Senate panel Donald Trump Jr. emerges as GOP fundraising force MSNBC's Nicolle Wallace: I told Jeb Bush 'he should have punched' Trump 'in the face' 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 ClintonHillary Clinton on if Bill should’ve resigned over Lewinsky scandal: ‘Absolutely not’ Electoral battle for Hispanics intensifies in Florida Trump adds campaign stops for Senate candidates in Montana, Arizona, Nevada MORE. He has said that, instead, the lawyer discussed American adoptions of Russian children.

Former campaign chairman Paul ManafortPaul John ManafortThree reasons Mueller may not charge Trump with obstruction Judge calls Manafort plea deal 'highly unusual' Calif. man ensnared in Mueller probe sentenced to 6 months in prison MORE and Trump's son-in-law Jared KushnerJared Corey KushnerFive things to watch for in deteriorating US-Saudi relations NYT: Kushner paid almost nothing in taxes thanks to business tax break Trump to call Saudi king about missing journalist 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 Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe 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 PapadopoulosCalif. man ensnared in Mueller probe sentenced to 6 months in prison The Mueller investigation: Where it stands at the midterms Mr. President, tear down the wall hiding those FISA abuses MORE, a former foreign policy adviser to Trump's campaign, have pleaded guilty to lying to the FBI about their contacts with Russian representatives.