Twitter post marks the first time that the elder Trump has publicly acknowledged the objective of the meeting, which was also attended by his then-Campaign Chair Paul Manafort, and Trump's son-in-law and senior adviser Jared Kushner. That initial statement said the meeting "primarily" involved a discussion of an obscure law governing American adoptions of Russians - not opposition research on Hillary Clinton.
Trump's former personal attorney, Michael Cohen, has claimed that the president knew about, and approved of, that meeting, according to multiple news reports.
Trumps Attorney Jay Sekulow, tried to soften his own part of the cover-up, saying on ABC's "This Week" that, "I had bad information in that statement".
"I had bad information at the time and made a mistake in my statement", Sekulow said Sunday, noting that he had only been working for Trump a short time when he made the misstatement previous year. More than a year ago, he tweeted: "Most politicians would have gone to a meeting like the one Don jr attended in order to get info on an opponent".
Why is the Trump Tower meeting controversial?
Russian Federation has denied allegations by United States intelligence agencies that it meddled and Trump denies collusion, describing the Mueller investigation as a political witch hunt.
When asked by host George Stephanopoulos how a meeting arranged to get information on an opponent could be legal, Sekulow responded: "Well, the question is, how would it be illegal?" Trump Jr. has told the Senate Judiciary Committee that he couldn't remember if he told his father about the meeting.
Sekulow said the important thing was that Trump's legal team shared accurate information with the special counsel.
The President this week has for the first time said that Attorney General Jeff Sessions "should stop" the Mueller probe.
President Donald Trump began his Sunday morning with media-bashing tweets so virulent - the "enemy of the people" are "very risky & sick!" and "can also cause War!" - that journalists and the Sunday morning Beltway programs immediately struck back. "You have to look at what laws, rules, regulations, statutes are purportedly violated here".
Mueller is examining whether Trump obstructed the investigation of Russia's role in the 2016 election.
He defended calling the media "The Enemy of the People", and said journalists "purposely cause great division & distrust" and can "cause War!" And at a trio of rallies, he escalated his already vitriolic rhetoric toward the media, savaging the press for unflattering coverage and, he feels, bias.