Special counsel Robert MuellerRobert (Bob) 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 TrumpHouse Intel to probe whether lawyers for Trump family interfered in investigation Trump Jr. subpoenaed after backing out of interviews: report Graham encourages Donald Trump Jr. to plead the Fifth 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 TrumpComey: Barr is 'sliming his own department' GOP Mueller critic says Flynn contacted him during special counsel probe: report Acting DHS secretary threatened to quit after clashing with Miller: report 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 TrumpUkraine's top prosecutor says no evidence of wrongdoing by Bidens New financial disclosure forms provide glimpses of Trump's wealth Trump's Doral resort revenue has dropped since presidential campaign: report MORE, met with the attorney, who promised damaging information on Hillary ClintonHillary Diane Rodham ClintonTop Dem: Trump helps GOP erase enthusiasm gap; Ohio a big problem The Hill's 12:30 Report: Trump threatens jail time over 'treason' and 'spying' Several factors have hindered 'next up' presidential candidates in recent years MORE — has become a flashpoint in the Russia probe.

Trump Jr., the president's son-in-law and senior adviser Jared KushnerJared Corey KushnerTrump: 'Good chance' Dems give immigration 'win' after Pelosi called White House plan 'dead on arrival' The Hill's Morning Report — Presented by Pass USMCA Coalition — Trump: GOP has `clear contrast' with Dems on immigration Trump's immigration push faces Capitol Hill buzzsaw MORE and former Trump campaign chairman Paul ManafortPaul John ManafortUkrainian who meddled against Trump in 2016 is now under Russia-corruption cloud Feds ask judge to postpone ex-Trump campaign aide's sentencing Giuliani cancels trip to Ukraine to press Biden investigation 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.