Special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE is reportedly looking into an interaction between a Russian lawyer and Ivanka TrumpIvana (Ivanka) Marie TrumpFive things we know about Dems' sprawling Trump probe Kushner to cooperate with Judiciary document requests Hillicon Valley: Kushner accused of using WhatsApp, personal email for official work | White House rejects request for Trump-Putin communications | Facebook left 'hundreds of millions' of passwords unsecured | Tech pressured to root out extremism MORE surrounding a controversial Trump Tower meeting during the campaign.

While the first daughter and now-White House adviser did not take part in the June 2016 meeting, she exchanged greetings with the Russian attorney and a lobbyist who attended the meeting as they stepped off an elevator, a person familiar with the exchange told the Los Angeles Times

Mueller's team is looking into any interactions the attorney, Natalia Veselnitskaya, and lobbyist, Rinat Akhmetshin, had with President TrumpDonald John TrumpHow to stand out in the crowd: Kirsten Gillibrand needs to find her niche Countdown clock is on for Mueller conclusions Omar: White supremacist attacks are rising because Trump publicly says 'Islam hates us' MORE's family members and inner circle, the Times reported.

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The June 2016 meeting — when the president's eldest son, Donald Trump Jr.Donald (Don) John TrumpFox's Chris Wallace challenges Nadler on whether no more indictments means no 'criminal collusion' Nadler willing to go to Supreme Court to obtain Mueller report Five things we know about Dems' sprawling Trump probe MORE, met with the attorney, who promised damaging information on Hillary ClintonHillary Diane Rodham ClintonHow to stand out in the crowd: Kirsten Gillibrand needs to find her niche Ex-Clinton aide: Dems should make 2020 'about integrity' Trump mounts Rust Belt defense MORE — has become a flashpoint in the Russia probe.

Trump Jr., the president's son-in-law and senior adviser Jared KushnerJared Corey KushnerFox's Chris Wallace challenges Nadler on whether no more indictments means no 'criminal collusion' Five things we know about Dems' sprawling Trump probe Mueller's end shifts focus to New York prosecutors MORE and former Trump campaign chairman Paul ManafortPaul John ManafortFox's Chris Wallace challenges Nadler on whether no more indictments means no 'criminal collusion' Nadler willing to go to Supreme Court to obtain Mueller report End of Mueller probe a boost for Trump, a warning for Democrats MORE all attended the meeting with the Russian lawyer and lobbyist.

Trump Jr. has maintained that the meeting was primarily to discuss American adoptions of Russian children. 

In an excerpt from a new book detailing the early months of the Trump presidency, former White House chief strategist Stephen Bannon is quoted as saying that there was "zero" chance that President Trump did not know about the meeting.