Christopher Krebs, director of the Cybersecurity and Infrastructure Security Agency, was fired by President Trump on Tuesday.

Department of Homeland Security Cybersecurity and Infrastructure Security Agency Director Christopher Krebs testifies on Capitol Hill in Washington, Wednesday, May 22, 2019, before the House Oversight and Reform National Security subcommittee hearing on “Securing U.S. Election Infrastructure and Protecting Political Discourse.” (AP Photo/Carolyn Kaster)