Chris Krebs, the former chief of the Cybersecurity and Infrastructure Security Agency (CISA), said there was no evidence that voting machines were exploited by foreign entities.

The cybersecurity expert's public statement calling the 2020 U.S. presidential polls "the most secure" in the country's history led to his termination on Nov. 17 by President Donald Trump.

Krebs has labeled Trump's claims of widespread voter fraud as "farcical." He made it clear that "all votes in the United States of America are counted in the United States of America. Period," CBS News reported.

Krebs said there is no evidence "that any machine that I am aware of has been manipulated by a foreign power," adding that the American people "should have 100 percent confidence in their vote," The Independent quoted him as saying.

Krebs has been the target of public criticism from the President since the Nov. 3 election over his agency's Rumor Control blog, which disproves a list of bogus accusations about election fraud and hacking. "I am proud of the work we did at CISA... I'm proud of the teammates I had at the agency. We did it right," NBC News reported.

Trump fired Krebs in a pair of tweets, saying his recent statement on the security of the 2020 U.S. Presidential election was "highly inaccurate." The social media network flagged the comments with a warning saying the accusations about election fraud were disputed.

Speaking about his termination, Krebs said it didn't come as a surprise. A source with knowledge of his sacking disclosed that Krebs found out about it via Twitter, which upset him, because he took the work seriously. It was all a matter of "when" and not "if" that Krebs would lose his job, sources close to him revealed in recent days.

Trump has repeatedly said that the poll numbers were rigged, although no convincing proof has validated the allegation, and several state and federal agencies have asserted the election was legitimate.

Trump, who has not conceded defeat in the election, said he would leave the Oval Office if the Electoral College votes for president-elect Joe Biden. According to reports, Biden won with 306 Electoral College votes compared to Trump's 232, and leads him by more than 6 million in the popular vote.

Krebs has been among the most vocal public officials dismissing unfounded accusations about election fraud and hacking, particularly disproving a conspiracy theory focused on Dominion Voting Systems equipment that Trump has pushed.