The country’s top federal watchdog vowed to maintain “aggressive” oversight of the government after 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 fired the intelligence community inspector general.

Michael Horowitz, the Justice Department’s inspector general and the chairman of the Council of the Inspectors General on Integrity and Efficiency, praised Michael Atkinson, the ousted intelligence official, and said he and his colleagues would continue his work.

“Inspector General Atkinson is known throughout the Inspector General community for his integrity, professionalism, and commitment to the rule of law and independent oversight,” Horowitz said. “The Inspector General Community will continue to conduct aggressive independent oversight of the agencies that we oversee.”

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Michael Horowitz, Chair of the Council of the Inspectors General on Integrity and Efficiency (CIGIE) and the Inspector General at the Department of Justice, issued a statement on the removal of Michael Atkinson, the Inspector General for the Intelligence Community (ICIG). pic.twitter.com/A0kIPHe2hV — Oversight.gov (@OversightGov) April 4, 2020

Atkinson was fired by Trump in a surprise Friday night letter to Congress saying that he “no longer” has confidence in the intelligence community inspector general. Atkinson, who had served as the intelligence community inspector general since May 2018, was the first to alert Congress last year of the whistleblower complaint regarding Trump’s dealings with Ukraine that ultimately sparked congressional impeachment proceedings.

Horowitz said Atkinson’s handling of the complaint was appropriate despite the White House’s efforts to block it from Congress, noting that the then-acting director of national intelligence said last year that Atkinson acted “by the book.”

Democrats have pounced on Trump for the late-night firing, accusing the president of a politically motivated retaliation over Atkinson’s handling of the whistleblower complaint.

“The shameful late-night firing of Inspector General Atkinson is a brazen act against a patriotic public servant who has honorably performed his duty to protect the Constitution and our national security, as required by the law and by his oath,” said Speaker Nancy Pelosi Nancy PelosiPowell warns failure to reach COVID-19 deal could 'scar and damage' economy Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies Intelligence chief says Congress will get some in-person election security briefings MORE (D-Calif.). “This latest act of reprisal against the Intelligence Community threatens to have a chilling effect against all willing to speak truth to power.”