Former FBI Director James Comey sent a goodbye note to FBI employees Wednesday, one day after he was abruptly fired by President Donald Trump.

Comey’s letter, published first by CNN, assured agency staff that “It is done, and I will be fine,” referring to his abrupt ouster.

He also urged the agency to maintain its “competence, honestly, and independence” and live up to what he said was its image as a “rock for America.”

As justification for Comey’s firing, Trump cited a memo by the newly-minted Deputy Attorney General Rod Rosenstein that was sharply critical of Comey’s handling of an investigation into Hillary Clinton’s use of a private email server.

Yet Trump had earlier praised Comey for his actions in that investigation, and various reports citing scores of unnamed sources paint a picture of a President increasingly uncomfortable with the FBI’s investigation into his campaign’s potential collusion with Russian officials during the 2016 election.

Various reports also indicate Trump asked Rosenstein and Attorney General Jeff Sessions to find a rationale for Comey’s firing. The Washington Post, citing an unnamed person close to the White House, reported that Rosenstein had threatened to resign as a result of Trump’s attempts to pin Comey’s firing on him.

Read Comey’s letter below in full, via CNN: