Former White House chief strategist Stephen Bannon said there was "zero" chance that President TrumpDonald John TrumpEsper sidesteps question on whether he aligns more with Mattis or Trump Warren embraces Thiel label: 'Good' As tensions escalate, US must intensify pressure on Iran and the IAEA 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 TrumpThe Hill's Morning Report — Trump retreats on census citizenship question Trump set to host controversial social media summit Trump associate Felix Sater grilled by House Intel 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 ClintonWhy Trump's bigoted tropes won't work in 2020 The Hill's Morning Report - Presented by JUUL Labs - House to vote to condemn Trump tweet GOP put on the back foot by Trump's race storm MORE. He has said that, instead, the lawyer discussed American adoptions of Russian children.

Former campaign chairman Paul ManafortPaul John ManafortTop Mueller prosecutor Zainab Ahmad joins law firm Gibson Dunn Russian oligarch's story could spell trouble for Team Mueller Trump, Mueller, the issue of 'guilt' and a do-nothing Congress MORE and Trump's son-in-law Jared KushnerJared Corey KushnerThe Hill's Morning Report — Trump retreats on census citizenship question Judiciary issues blitz of subpoenas for Kushner, Sessions, Trump associates House Judiciary to vote to authorize subpoenas for Trump officials, immigration documents 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 MuellerTop Republican considered Mueller subpoena to box in Democrats Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate 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 PapadopoulosInquiry into origins of Russia investigation is a scam Trump accuses Democrats of crime amid rising calls for impeachment Comey: Trump peddling 'dumb lies' MORE, a former foreign policy adviser to Trump's campaign, have pleaded guilty to lying to the FBI about their contacts with Russian representatives.