He concludes the tweet by saying, "I did not know about it!"
CNN reported last month that Michael Cohen, the president's longtime personal lawyer, was willing to tell Mueller that Trump did know about the Trump Tower meeting in advance. 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.
The meeting took place in Trump tower in NY, and the president originally claimed it concerned the issue of global adoptions.
President Trump repeatedly insists there was no collusion between his campaign and the Russian government, and he will undoubtedly continue to maintain that.
The president, according to reports, has grown anxious that his son may be in the crosshairs of special counsel Robert Mueller for the Trump Tower meeting, which was also attended by onetime Trump campaign chair Paul Manafort and Jared Kushner.
One part of Mueller's inquiry and congressional investigations has focused on a meeting months before the November election in Trump Tower in NY between Russian officials, Donald Trump Jr., the president's eldest son, and other campaign aides.
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Previously, the Trumps pushed another explanation for the meeting, after having failed to disclosed it and denied anything of the sort had ever happened in the first place. In it, lawyers stated that Trump had dictated the statement written aboard Air Force One as it flew back from the G-20 summit in Germany.
Manafort is now on trial for unrelated bank and tax fraud charges as part of Special Counsel Robert Mueller's investigation, and Sekulow said that to his knowledge, Trump Jr.is not the target of a federal probe stemming from the meeting. She suggested, however, that Trump's supporters in the Republican Party just might choose to defend him if it is proven that his campaign did indeed collude with Russian officials ahead of the 2016 presidential elections.
Trump called the Post report "a complete fabrication". Working with a foreign national with the intent of influencing a USA election could violate multiple laws, according to legal experts.
The Trump team has argued that Mr Trump Jr ultimately did not receive any damaging information about Mrs Clinton at the meeting. Why did Trump start using a more specific number 40 minutes after a meeting "to get information on an opponent" began?
Any legal battle over whether the president can be forced to testify could go all the way to the US Supreme Court, the lawyer, Jay Sekulow, said on ABC's This Week show.
On Sunday, one of the president's attorneys defended the 2016 meeting as something that would not have been illegal under any federal statute.