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 TrumpIvanka Trump to campaign for Devin Nunes in California The Hill's 12:30 Report — Sponsored by Delta Air Lines — Trump now says Korea summit could still happen June 12 Ivanka to hit the campaign trail with McCarthy in California 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 TrumpTrump: Meetings on potential North Korea summit going 'very well' Freed American 'overwhelmed with gratitude' after being released from Venezuela Ivanka Trump to campaign for Devin Nunes in California 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 TrumpTrump Jr.: Instagram warning says my name 'encourages' harmful behavior Trump resort in Scotland pays women less than men: report Dem senator: Trump Jr. may have given 'false testimony' about meeting with foreign nationals MORE, met with the attorney, who promised damaging information on Hillary ClintonHillary Diane Rodham ClintonTrump lashes out at 'rigged' Russia probe in pair of tweets Clapper: 'More and more' of Steele dossier proving to be true Republicans are strongly positioned to win Congress in November MORE — has become a flashpoint in the Russia probe.

Trump Jr., the president's son-in-law and senior adviser Jared KushnerJared Corey KushnerChristie blocks release of correspondence with Kushner Companies The Hill's Morning Report — Sponsored by PhRMA — The art of walking away from the deal Director of federal prisons resigns after clashes with Kushner, Sessions: report MORE and former Trump campaign chairman Paul ManafortPaul John ManafortTrump lashes out at 'rigged' Russia probe in pair of tweets Judge rejects Manafort's attempt to throw out some charges Giuliani: White House wants briefing on classified meeting over Russia probe 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.