Former White House chief strategist Stephen Bannon said there was "zero" chance that President TrumpDonald John TrumpAl Gore: Trump has had 'less of an impact on environment so far than I feared' Trump claims tapes of him saying the 'n-word' don't exist Trump wanted to require staffers to get permission before writing books: 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.Donald (Don) John TrumpSpicer slams Omarosa on WH recordings: 'She will do anything to further her own being' White House staff offered discounts at Trump's NJ golf club: report Republicans have spent .5 million at Trump properties since he took office: report 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 ClintonHillicon Valley: FBI fires Strzok after anti-Trump tweets | Trump signs defense bill with cyber war policy | Google under scrutiny over location data | Sinclair's troubles may just be beginning | Tech to ease health data access | Netflix CFO to step down Signs grow that Mueller is zeroing in on Roger Stone Omarosa claims president called Trump Jr. a 'f--- up' for releasing Trump Tower emails MORE. He has said that, instead, the lawyer discussed American adoptions of Russian children.

Former campaign chairman Paul ManafortPaul John ManafortRoger Stone: 'No circumstance' where I would testify against Trump Hillicon Valley: FBI fires Strzok after anti-Trump tweets | Trump signs defense bill with cyber war policy | Google under scrutiny over location data | Sinclair's troubles may just be beginning | Tech to ease health data access | Netflix CFO to step down Prosecutors rest their case against Manafort MORE and Trump's son-in-law Jared KushnerJared Corey KushnerCanada may secure America's nuclear nonproliferation bacon Omarosa telling friends she has tapes of Ivanka, Kushner too: report Saudis show separation of oil and state in spat with Canada 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 PapadopoulosSigns grow that Mueller is zeroing in on Roger Stone The Hill's Morning Report: Where the Mueller probe stands Opinion: How a senior DOJ official helped Dem researchers on Trump-Russia case MORE, a former foreign policy adviser to Trump's campaign, have pleaded guilty to lying to the FBI about their contacts with Russian representatives.