Michael Cohen has given substantial help on how Russian nationals tried to affect the 2016 election, a legal memo has revealed.
His help is detailed in the memo from Robert Mueller, who is heading the investigation into alleged Russian collusion with the Trump team.
Robert Mueller’s memo is mainly to guide sentencing for crimes President Trump’s ex-lawyer has admitted.
A second memo sets out the case against Donald Trump’s ex-campaign chief Paul Manafort for breaching a plea bargain deal.
Michael Cohen and Paul Manafort are among a number of President Trump aides being investigated in Special Counsel RobertMueller’s investigation.
Both have been co-operating with his team but Robert Mueller now accuses Paul Manafort of lying.
In a separate court filing onDecember 7, prosecutors in New York made their case for the length of Michael Cohen’s sentence when it is delivered on December 5.
They say Donald Trump’s ex-lawyer should serve a “substantial” jail term after admitting violating campaign finance laws, committing tax evasion and lying to Congress.
President Trump has repeatedly denied there was any collusion with Russian officials, calling the investigation a “witch hunt”.
The White House said the memos offered nothing new or damaging about the president.
President Trump tweeted: “Totally clears the President. Thank you!”
Michael Cohen had admitted making false statements about a Trump property deal, out of loyalty to the president.
The memo says that although this crime was serious, any sentencing should be served concurrently with the NewYork prosecutors’ recommendations on other crimes.
The memo says Michael Cohen has taken “significant steps to mitigate his criminal conduct”.
The memo’s key elements are about the Russian links.