Trump fires cybersecurity official who refuted claims of election fraud
02:21In an overnight tweet, President Trump fired Chris Krebs, the nation's top cybersecurity official, who oversaw the election's security effort and called it the “most secure” in U.S. history. Meanwhile, President-elect Biden's team is making new calls for the White House to share key information with them. NBC White House correspondent Kristen Welker reports for TODAY.