President Trump has fired FBI Director James Comey, the White House announced Tuesday afternoon.

“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.

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

In a statement on Comey's firing released by the White House, Trump called the FBI "one of our Nation’s most cherished and respected institutions," adding, "today will mark a new beginning for our crown jewel of law enforcement."

The White House said that a search for a new permanent FBI director would "begin immediately."

Comey's firing sent ripples across Washington, with many questioning the timing of the dismissal.

Several GOP lawmakers voiced support for the former FBI chief and thanked him for his service, while a number of Democrats slammed the decision, arguing the firing showed that the FBI was making headway on its investigation into ties between the Trump campaign and Russia.

"The next FBI director must be strong and independent and will receive a fair hearing in the Judiciary Committee," Feinstein said in a statement.

Sen. Chuck Grassley Charles (Chuck) Ernest GrassleySenate Republicans signal openness to working with Biden Senators offer disaster tax relief bill Trump spikes political football with return of Big Ten season MORE (R-Iowa), the chairman of the Senate panel, threw his support behind Trump's decision while casting doubt on "the trust and political independent of the FBI" under Comey. Grassley asserted that Comey had "lost" the public's trust and confidence.

“Over the course of the last several months, Director Comey's decisions on controversial matters have prompted concern from across the political spectrum and from career law enforcement experts," Grassley said in a statement.

“The handling of the Clinton email investigation is a clear example of how Comey's decisions have called into question the trust and political independence of the FBI. In my efforts to get answers, the FBI, under Comey's leadership, has been slow or failed to provide information that Comey himself pledged to provide," he continued.

“The FBI Director serves at the pleasure of the president. Under these circumstances, President Trump accepted the recommendation of the Justice Department that the Director lacked the confidence needed to carry out his important duties.”

–Mike Lillis contributed

Updated: 7:27 p.m.