Democratic senators sharply criticized President Donald Trump's decision to fire FBI director James Comey on Tuesday, with some calling for a special prosecutor to investigate Russian meddling into the 2016 US election and any connection to Trump's aides.

Axar.az reports citing CNN.

"Mr. President, with all due respect, you are making a big mistake," Senate Minority Leader Chuck Schumer told reporters he told Trump when the President called him earlier.

Schumer added that it's time for a special prosecutor to lead an investigation and that "this investigation must be run as far away as possible from this White House."

Sen. Mark Warner, the top Democrat on the Senate intelligence committee, said Tuesday evening that he wanted the Senate panel to hear from Comey as part of its investigation into alleged Russian interference in the 2016 elections and questions about potential collusion between Russia and the Trump campaign.

"This is Nixonian," Pennsylvania Democratic Sen. Bob Casey said in a statement. "Deputy Attorney General Rod Rosenstein must immediately appoint a special counsel to continue the Trump/Russia investigation."

Casey cited Comey's testimony last week before Congress where he confirmed the Department of Justice's investigation of Russian meddling included "investigating the nature of any links between individuals associated with the Trump campaign and the Russian government and whether there was any coordination."

"We are careening ever closer to a Constitutional crisis, and this development only underscores why we must appoint a special prosecutor to fully investigate any dealings the Trump campaign or administration had with Russia," said Sen. Ed Markey, a Massachusetts Democrat, in a statement.

House Democratic Leader Nancy Pelosi called for "an independent, bipartisan commission" following Comey's firing.

"The President's sudden and brazen firing of the FBI Director raises the ghosts of some of the worst Executive Branch abuses," Pelosi said in a statement. "We cannot stand by and watch a coverup of the possible collusion with a hostile foreign power to undermine American democracy."

At last week's hearing, Comey confirmed that the FBI's investigation into possible coordination between Trump's presidential campaign and Russian officials was continuing.