Rep. Keith Ellison (D-Minn.), the deputy chairman of the Democratic National Committee (DNC), said Tuesday that FBI Director James Comey’s firing is evidence of a “Constitutional crisis.”

“We are witnessing a Constitutional crisis unfold before our very eyes,” Ellison said in a statement Tuesday.

Ellison added that the circumstances around Comey’s exit, coming as the FBI investigates ties between Russia and President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE's campaign, raise questions about his replacement’s credibility.

“The next FBI Director appointed by President Trump will not have the independence or confidence of the American people to continue this investigation,” he said.

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“In order to preserve the integrity of the investigation and the government, we need a special prosecutor to probe the possible collusion between Donald Trump’s campaign and Russian government officials.”

DNC Chairman Tom Perez said that Trump’s firing of Comey is a “brazen and disgraceful abuse of power.”

“The fact that the leadership of the Justice Department was complicit in manufacturing this joke of a rationale for Comey’s dismissal at the request of the Trump is further evidence that nobody in this administration can be trusted to lead an investigation into a serious national security issue,” he said.

The White House announced Tuesday that Trump fired Comey following recommendations from the Department of Justice over his handling of the investigation into Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE's treatment of classified emails.

White House press secretary Sean Spicer told reporters that Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE and his deputy, Rod Rosenstein, pushed for the move.

“While I greatly appreciate you informing me, on three separate occasions, that I am not under investigation, I nevertheless concur with the judgment of the Department of Justice that you are not able to lead the bureau,” Trump wrote in a letter to Comey dated Tuesday.

“It is essential that we find new leadership for the FBI that restores public trust and confidence in its vital law enforcement mission.”

The White House added that a search for a new permanent FBI director would “begin immediately.”

The firing sent waves across Washington on Tuesday, with many questioning the timing of Comey’s firing.

Comey announced in March that the FBI was probing alleged coordination between Trump’s campaign and Russia during the 2016 presidential race.