McCabe served as acting director of the FBI after President Trump fired James Comey in the spring of 2017. McCabe felt that there was enough circumstantial evidence to open criminal and counterintelligence investigations into the president's ties to Russia and possible obstruction of justice. "These were extraordinary steps. They were ones that we took only after great consideration and review," he says. In March of 2018, McCabe was fired 26 hours before he was set to retire. He talks with Terry Gross about these events and how the president poses a threat to national security. His book is 'The Threat: How the FBI Protects America in the Age of Terror and Trump.'