Donald Trump’s former personal lawyer Michael Cohen said that Mr Trump knew in advance about a June 2016 meeting in Trump Tower at which Russians offered to provide damaging information about his Democratic rival Hillary Clinton, according to reports.

CNN and NBC, citing unnamed sources with knowledge of the matter, said Cohen is willing to make that assertion to Special Counsel Robert Mueller, who is investigating possible collusion between the Trump campaign and Russia during the US 2016 presidential campaign.

Mr Trump again denied knowledge of the meeting in a string of tweets early on Friday morning. "I did NOT know of the meeting with my son, Don jr," he said.

Rudy Giuliani, Mr Trump’s new lawyer said on Thursday Cohen "could not be believed". Referring to the Mueller investigation, he added: "If they rely on him … it would destroy whatever case they have."

Federal prosecutors in New York are investigating Cohen for possible bank and tax fraud, and for possible campaign law violations linked to a $130,000 payment to adult film star Stormy Daniels, who has claimed she had a sexual encounter with Trump, and other matters related to Trump’s campaign, a person familiar with the investigation has told Reuters.

Cohen has not been charged with any crime. Trump has denied having had an encounter with Daniels.

Previously Trump has denied knowing in advance that the Trump Tower meeting was going to take place, and he has denied that there was any collusion between his campaign and Russia. Moscow has denied meddling in the election.

Trump’s eldest son, Donald Trump Jr, along with Trump’s son-in-law Jared Kushner and senior campaign aide Paul Manafort took part in the meeting with Nataliya Veselnitskaya, a Russian lawyer and acknowledged Kremlin informant.

Donald Trump Jr told investigators from the Senate Judiciary Committee in September 2017 that he did not tell his father about the meeting beforehand, according to documents released by the committee.

Profile | Michael Cohen

Alan Futerfas, a lawyer for the Trump Organization and Donald Trump Jr, told Reuters, "Donald Trump Jr has been professional and responsible throughout the Mueller and Congressional investigations. We are very confident of the accuracy and reliability of the information that has been provided by Mr Trump, Jr, and on his behalf."

Cohen did not immediately respond to a request for comment. His attorney Lanny Davis declined to comment.

Peter Carr, a spokesman for Mueller, declined to comment. Nicholas Biase, a spokesman for Manhattan federal prosecutors, also declined to comment.

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