From his perch atop the DHS Cybersecurity and Infrastructure Security Agency, Chris Krebs has been using his agency’s “Rumor Control” website — and his personal Twitter feed — to take on the viral conspiracies that are circulating widely in conservative circles, some of which have been promoted by the president and his top allies. Launched prior to the election to help voters navigate domestic and foreign misinformation, the website has now essentially morphed into a post-election fact-checking operation for the outgoing president and his supporters.

Reports of dead people voting? The website notes the “reality” is that “election integrity measures protect” against this — an implicit rebuke of Trump lawyer Rudy Giuliani’s recent statements.

Reports that thousands of “Biden-only ballots” show rampant fraud? The website notes these ballots show up in every election “and do not by themselves indicate fraud” — indirectly contradicting Trump campaign legal adviser Sidney Powell…

“This is not a real thing,” Krebs tweeted in response to a conspiracy theory floated by Trump’s allies — including a prominent Fox News host — about a computer called “Hammer” and corresponding program called “Scorecard” that some conservatives say secretly siphoned votes from Trump to President-elect Joe Biden.