Red flags raised about FBI’s Biden informant as far back as 2016

Federal prosecutors were put on notice as far back as 2016 that Alexander Smirnov, the confidential FBI informant whose alleged lies about President Biden’s business dealings fueled — and then damaged — a Republican impeachment effort, was a known “liar and a fraudster.”  Undated photo of Alexander Smirnov, former FBI informant, obtained by CBS News.