Former US Attorney Preet Bharara mocked President Trump after he said he "strongly pressed" Russian President Vladimir Putin on Russia's interference in the U.S. election, which Putin "vehemently denied."

"When pursuing a corrupt politician, mobster or murderer on strong FBI evidence, if he ‘vehemently denied it,' we just dropped it usually," Bharara sarcastically wrote on Twitter.

When pursuing a corrupt politician, mobster or murderer on strong FBI evidence, if he "vehemently denied it," we just dropped it usually. https://t.co/d4HqyHQexB — Preet Bharara (@PreetBharara) July 9, 2017

Trump had tweeted earlier: "I strongly pressed President Putin twice about Russian meddling in our election. He vehemently denied it. I've already given my opinion."

Trump's tweet drew swift backlash, with many accusing the president of letting Russia off the hook after U.S. intelligence agencies determined Russia interfered in the 2016 election, possibly to Trump's benefit.

Bharara has been an outspoken critic of Trump since he was fired by the president in March after he refused to resign.