Former White House chief strategist Stephen Bannon said there was "zero" chance that President TrumpDonald John TrumpJimmy Fallon responds to Trump: I'll donate to pro-immigrant nonprofit in his name South Carolina GOP candidate expected to make full recovery after car accident Official: US to present North Korea with timeline, 'specific asks' 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 TrumpDonald Trump Jr. headlines Montana Republican convention NYPD being sued for info on gun permits held by Trump, his sons The Hill's Morning Report — Sponsored by PhRMA — GOP lawmakers race to find an immigration fix 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 ClintonWhat did Peter Strzok do? The strategic blunder of ‘Trump-as-Hitler’ Races to watch in Tuesday’s primaries MORE. He has said that, instead, the lawyer discussed American adoptions of Russian children.

Former campaign chairman Paul ManafortPaul John ManafortWhat did Peter Strzok do? Manafort's attorney asks judge to bar mention of Trump ties in trial Mueller may be preparing to hand off prosecution as part of winding down his investigation: report MORE and Trump's son-in-law Jared KushnerJared Corey KushnerKushner knocks Abbas, says Mideast peace plan will be published soon The Hill's Morning Report — Sponsored by PhRMA — Immigration drama grips Washington Trump Organization, Kushner Companies cut ties on hotel deal 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 PapadopoulosMueller asks judge for September sentencing for Papadopoulos Senate staffer's indictment exposes the pitifully corrupt nature of Trump-Russia probe Hillicon Valley: Deal reached on ZTE, but lawmakers look to block it | New encryption bill | Dems push Ryan for net neutrality vote | Google vows it won't use AI for weapons MORE, a former foreign policy adviser to Trump's campaign, have pleaded guilty to lying to the FBI about their contacts with Russian representatives.