If he has to testify under oath, US President Donald Trump will deny he ever asked former FBI director James Comey to treat former national security adviser Michael Flynn leniently, his lawyer said on Sunday.

“There was no conversation about Michael Flynn,” Rudy Giuliani said on CNN’s State of the Union program regarding the February 14, 2017, meeting in the Oval Office.

The private chat figures prominently in Special Counsel Robert Mueller’s probe into possible obstruction of justice in the Russia election interference case.

Comey testified in Congress last year that Trump tried to persuade him to go easy on Flynn the day after the president sacked his national security adviser for lying about his contact with the Russian ambassador.

“I hope you can see your way to letting Flynn go. He’s a good guy. I hope you can let this go,” Comey quoted Trump as saying.

Trump sacked Comey in May 2017, later admitting on TV that the FBI’s Russia investigation was on his mind when he made the decision.