Krebs has drawn praise from both Democrats and Republicans for his handling of the U.S. election, which generally ran smoothly despite persistent fears that foreign hackers might try to undermine the vote.

But he drew the ire of the Trump White House over a website run by CISA dubbed “Rumor Control” which debunks misinformation about the election, according to the three people familiar with the matter.

White House officials have asked for content to be edited or removed from the website, which has pushed back against numerous false claims about the election, including that Democrats are behind a mass election fraud scheme. In response, CISA officials have refused to delete accurate information.

In particular, one person said, the White House was angry about a CISA post rejecting a conspiracy theory that falsely claims 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.