The president publicly fired Christopher Krebs, former Director of the Cybersecurity and Infrastructure Security Agency (CISA), on Twitter.
Mr Trump tweeted: "The recent statement by Chris Krebs on the security of the 2020 Election was highly inaccurate, in that there were massive improprieties and fraud - including dead people voting, Poll Watchers not allowed into polling locations, 'glitches' in the voting machines which changed votes from Trump to Biden, late voting, and many more.
"Therefore, effective immediately, Chris Krebs has been terminated as Director of the Cybersecurity and Infrastructure Security Agency."
He has repeatedly denied claims by the president that the election was fraudulent, saying last week: "The November 3rd election was the most secure in American history."
According to reports in US media, Mr Krebs was warned the White House may begin to attack him personally following his refusal to defend the president, after supporters of Mr Trump began targeting him.
He apparently learned of his sacking via President Trump's tweet.
Tweeting after his dismissal, Mr Krebs wrote: "Honored to serve. We did it right. Defend Today, Secure Tomorrow. #Protect2020".
The outgoing president remains staunchly defiant that fraud took place during the election and is still opening lawsuits in swing states in an attempt to get results overturned - despite having no hard evidence of any wrongdoing.
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