Several top Democrats - and at least one Republican - criticized President Trump for firing FBI Director James Comey.

Senator Bob Casey Jr. (D-Pennsylvania) compared Trump to President Richard Nixon in the way he terminated Comey in the midst of an investigation into Russian collusion.

"This is Nixonian. Deputy Attorney General Rod Rosenstein must immediately appoint a special counsel to continue the Trump/Russia investigation... This investigation must be independent and thorough in order to uphold our nation’s system of justice," Casey said in a statement.

Former 2016 vice presidential candidate Sen. Tim Kaine (D-Virginia) echoed Casey, firing off a series of tweets accusing Trump of firing Comey as a way to interfere in any investigation the FBI was conducting on his alleged Russian ties.

Krauthammer: 'Implausible' That Comey Was Fired Over Clinton Comments Last Year

Williams: Firing Comey 'Important Way of FBI Regaining Credibility'

Schweizer to ObamaCare Architect: 'If You Lose Bill Clinton, The War Is Lost'

House Democratic Caucus Chairman Joseph Crowley (D-New York) called Trump's decision "extremely troubling."

"President Trump fired the man investigating him and his cohorts. I strongly support calls for the appointment of a special prosecutor," Crowley said.

Senator Chris Van Hollen of Maryland jabbed Trump over his reality show punchline, "You're Fired," saying that it "doesn't work" in politics.

Congressman Carlos Curbelo, a Republican from South Florida, also questioned why Comey was fired:

Libertarian-leaning Rep. Justin Amash (R-Illinois) said he is studying whether it would be appropriate to call for an independent investigation into Russia's actions during the election, since Comey is no longer at his post.

Senator Richard Burr (R-North Carolina), the chairman of the intelligence committee, criticized Trump's firing of Comey:

New York's junior senator Kirsten Gillibrand also pointed to recent accusations of Russian collusion in her criticism of Comey's dismissal:

Senate Minority Whip Richard Durbin (D-Illinois) released a lengthy statement on the matter:

Senator Edward Markey (D-Massachusetts) said Comey's firing reminded him of the "Saturday Night Massacre" in the 1970s, when Nixon fired an independent prosecutor and accepted the resignation of a number of DOJ officials in the midst of the Watergate affair.

“President Trump’s firing of Director Comey sets a deeply alarming precedent as multiple investigations into possible Trump campaign or administration collusion with Russia remain ongoing, including an FBI investigation. 

This episode is disturbingly reminiscent of the Saturday Night Massacre during the Watergate scandal and the national turmoil that it caused. 

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.” 

House Minority Whip Steny Hoyer (D-Maryland), the second-highest ranking Democrat in the House, said Comey's firing is "deeply troubling and raises serious questions."

Senator Bill Nelson of Florida called for an independent investigation into Russian interference after hearing of Comey's firing.

Senator Maria Cantwell (D-Washington) joined calls for a special prosecutor into the Russian allegations due to Comey's firing.

What do you think of Comey's firing? Let us know in the comments and check out Charles Krauthammer's reaction HERE.

Mexico Slams Texas Sanctuary City Ban

Climate Change Activists Say It's Time to Give Up Meat for Insects

Liberal Activists to Hold Mock Funerals, Send Ashes to GOP Lawmakers