WASHINGTON (NewsNation Now) — President Donald Trump on Tuesday fired the director of the federal agency that vouched for the reliability of the 2020 election.

Trump fired Christopher Krebs in a tweet, saying his recent statement defending the security of the election was “highly inaccurate.”

The firing of Krebs, a Trump appointee and director of the Cybersecurity and Infrastructure Security Agency, comes as Trump is refusing to recognize the victory of Democratic President-elect Joe Biden, as called by The Associated Press and other media outlets. He fired Defense Secretary Mark Esper on Nov. 9, part of a broader shakeup that put Trump loyalists in senior Pentagon positions.

Krebs. a former Microsoft executive, ran the agency, known as CISA, from its creation in the wake of Russian interference with the 2016 election through the November election. He won bipartisan praise as CISA coordinated federal state and local efforts to defend electoral systems from foreign or domestic interference.

Krebs tweeted from his personal account late Tuesday saying “honored to serve. We did it right.”

Before the 2020 election, CISA issued statements dismissing claims that large numbers of dead people could vote or that someone could change results without detection.

It also distributed a statement from a coalition of federal and state officials concluding there was no evidence that votes were compromised or altered in the Nov. 3 election and that the vote was the most secure in American history.

CISA works with the state and local officials who run U.S. elections as well as private companies that supply voting equipment to address cybersecurity and other threats while monitoring balloting and tabulation from a control room at its headquarters near Washington. It also works with industry and utilities to protect the nation’s industrial base and power grid from threats.