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’s first year in office was the year of the woman US officials warned Kushner about friendship with Wendi Deng Murdoch: report Top House Intel Dem wants to call Ivanka as witness in Russia probe 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 TrumpDems flip Wisconsin state Senate seat Sessions: 'We should be like Canada' in how we take in immigrants GOP rep: 'Sheet metal and garbage' everywhere in Haiti 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 TrumpIntel Dem decries White House 'gag order' after Bannon testimony House Intel Dem: Bannon asserted ‘very novel’ definition of executive privilege during testimony 'Total free-for-all' as Bannon clashes with Intel members MORE, met with the attorney, who promised damaging information on Hillary ClintonHillary Diane Rodham ClintonIntel Dem decries White House 'gag order' after Bannon testimony 'Total free-for-all' as Bannon clashes with Intel members Mellman: On Political Authenticity (Part 2) MORE — has become a flashpoint in the Russia probe.

Trump Jr., the president's son-in-law and senior adviser Jared KushnerJared Corey KushnerHope Hicks to meet with House Intel in Russia probe: report US officials warned Kushner about friendship with Wendi Deng Murdoch: report Overnight Regulation: Fight erupts over gun export rules | WH meets advocates on prison reform | Officials move to allow Medicaid work requirements | New IRS guidance on taxes MORE and former Trump campaign chairman Paul ManafortPaul John Manafort'Total free-for-all' as Bannon clashes with Intel members Overnight Cybersecurity: Bipartisan bill aims to deter election interference | Russian hackers target Senate | House Intel panel subpoenas Bannon | DHS giving 'active defense' cyber tools to private sector Manafort associate Richard Gates no longer under home confinement 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.