President Donald Trump's former personal lawyer says he is providing "critical information" as part special counsel Robert Mueller's investigation into Russian interference in the 2016 US election and possible coordination between Russia and the Trump campaign.
Michael Cohen, who pleaded guilty to campaign finance and other charges last month, said Thursday he is providing the information to prosecutors without a cooperation agreement.
Trump's longtime fixer-turned-foe could be a vital witness for prosecutors as they investigate whether Trump's campaign coordinated with Russians. For more than a decade, Cohen was Trump's personal lawyer, and he was a key power player in the Trump Organisation and a fixture in Trump's political life.
Cohen pleaded guilty in August to eight federal charges and said Trump directed him to arrange payments before the 2016 election to buy the silence of porn actress Stormy Daniels and a former Playboy model who had both alleged they had affairs with Trump.
It was the first time any Trump associate implicated Trump himself in a crime, though whether or when a president can be prosecuted remains a matter of legal dispute.
On Thursday night, Cohen tweeted: "Good for @MichaelCohen212 for providing critical information to the #MuellerInvestigation without a cooperation agreement. No one should question his integrity, veracity or loyalty to his family and country over @POTUS @realDonaldTrump."
The president has continued a very public battle against the Mueller investigation, repeatedly calling it a politically motivated and "rigged witch hunt."