'WE DID IT RIGHT'
On his own Twitter account, Krebs did not back down, writing: "Honored to serve. We did it right. Defend Today, Secure Tomorrow."
White House officials had previously complained about CISA content that pushed back against false claims about the election, including that Democrats were behind a mass election fraud scheme. CISA officials declined to delete accurate information.
Among other things, one associate of Krebs said the White House was angry about a post rejecting a conspiracy theory that falsely claimed an intelligence agency supercomputer and program, purportedly named Hammer and Scorecard, could have flipped votes nationally. No such system exists, according to Krebs, election security experts and former U.S. officials.
A spokesman for President-elect Joe Biden said: "Chris Krebs should be commended for his service in protecting our elections, not fired for telling the truth."
Trump's move was also quickly denounced by security officials and White House critics.
"Krebs was doing important work defending critical infrastructure and fighting disinformation," said Harri Hursti, an expert on electronic voting security. "His firing is very disappointing and appears to be an attempt to undermine the great work he and others at DHS/CISA have been doing."
Democrat Adam Schiff, who heads the House of Representatives Intelligence Committee, said: "The CISA and Director Krebs have worked diligently to safeguard our elections, provide vital support to state and local election officials, and inform the American people about what was true and what was not."
Independent Senator Angus King said Trump was “firing Mr Krebs for simply doing his job."
"I hope that President-elect Biden will recognize Chris’s contributions, and consult with him as the Biden administration charts the future of this critically important agency,” King said.
Senator Ben Sasse, who has been a Trump critic, was among the first Republicans to push back against the decision.
"Chris Krebs did a really good job — as state election officials all across the nation will tell you — and he obviously should not be fired," Sasse said in a statement.