President 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 and removing high-level officials seen as insufficiently loyal.