‘New Yorker’ staff writer Jane Mayer tells the story of ex-spy Christopher Steele, the man behind the unverified dossier detailing Trump’s ties with Russia. We’ll talk about how the dossier was compiled, and why so little was done about its findings during the campaign — even after Steele told the FBI. Steele also wrote a memo after the election about the possibility that Russians blocked Trump’s first choice for Secretary of State, Mitt Romney.