These allegations were not proven and were tossed out by many state and federal judges, election officials, governors, and government agencies. On December 1, 2020, U.S. Attorney General William Barr said U.S. attorneys and FBI agents had investigated complaints and allegations of fraud, but found none of significance. Director of National Intelligence John Ratcliffe said no evidence had been found of other countries trying to hack the election. Cybersecurity and Infrastructure Security Agency Director Chris Krebs called the election "the most secure in American history", which caused Trump to fire him. Trump attorney Joseph diGenova wanted Krebs to be executed.