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 TrumpTrump says he will decide Nielsen's fate 'shortly' The Hill's Morning Report — Presented by T-Mobile — Turbulence in the West Wing as shakeup looms Trump eyes post-midterm shakeup 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 TrumpMeet the lawyer Democrats call when it's recount time Avenatti denies domestic violence allegations: 'I have never struck a woman' Trump names handbag designer as ambassador to South Africa 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 TrumpSocial media explodes over Avenatti arrest Mueller targets Stone in final push Robert De Niro says goodbye to ‘Jeff Sessions’ on ‘Saturday Night Live’ MORE, met with the attorney, who promised damaging information on Hillary ClintonHillary Diane Rodham ClintonMeet the lawyer Democrats call when it's recount time Overnight Defense — Presented by Raytheon — Mattis defends border deployment during visit to troops | Bolton aide exits WH after clash with first lady | House blocks Yemen war resolution | Report warns of erosion in US military superiority Exit polls show more women breaking with Republicans MORE — has become a flashpoint in the Russia probe.

Trump Jr., the president's son-in-law and senior adviser Jared KushnerJared Corey KushnerTrump throws support behind criminal justice bill Trump says he will decide Nielsen's fate 'shortly' McConnell outlines hurdles to criminal justice reform MORE and former Trump campaign chairman Paul ManafortPaul John ManafortMueller asks for delay in Gates sentencing: filing Mueller targets Stone in final push 5 things to know about new acting Attorney General Matthew Whitaker 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.