Andrew McCabe tells "60 Minutes" why he opened investigations involving Trump

In his first interview since being fired, former FBI Deputy Director Andrew McCabe is telling "60 Minutes" why he opened up investigations involving President Trump. He was a career official at the Justice Department who oversaw the bureau's investigations into Russia's election meddling and Hillary Clinton's emails. In his new book, "The Threat: How the FBI protects America in the Age of Terror and Trump," McCabe describes extraordinary measures justice officials took in the wake of former FBI Director James Comey's firing. Scott Pelley joins "CBS This Morning" to preview his Sunday's report.

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