President Donald Trump personally dictated the statement his son gave on his talks with a Russian lawyer during the election campaign, US media report.
It said Donald Trump Jr and the lawyer had mostly discussed the adoption of Russian children in June 2016.
Trump Jr later revealed he had agreed to meet her after being told he could receive damaging material on Hillary Clinton.
President Trump has repeatedly denied any collusion with Russia.
The Senate, House of Representatives and a special counsel are all investigating alleged Russian interference in the presidential election which took the form of attempts to undermine Clinton – a claim denied by the Kremlin.
The reports about Trump Jr’s statement came in the midst of further turmoil at the White House.
White House communications director Anthony Scaramucci was fired on Monday after fewer than 10 days in the post.
The former Wall Street financier had drawn criticism after calling a reporter to give a profanity-laced tirade against his colleagues.
Reports that President Trump had himself dictated the statement his son issued about the meeting with lawyer Natalia Veselnitskaya first emerged in the Washington Post. It cited multiple sources.
The initial plan was that Trump Jr fully disclose what he knew about the meeting, the Post says, but that decision was reversed and his first statement said they had discussed the adoption of Russian children, not campaign issues.
Trump Jr later acknowledged that he had agreed to meet after being told Kremlin-linked information about Clinton would be offered during the talks.
He also released the email exchange that brought about the meeting.
The Washington Post says some of the president’s advisers fear the extent of the president’s intervention could place him and some of his inner circle in legal jeopardy.