Former Republican Rep. Newt Gingrich was speaker of the House between 1995 and 1999, including the time when President Bill Clinton was impeached. He is also an author and a former presidential candidate. Gingrich joins "CBS This Morning" to discuss special counsel Robert Mueller's report and his new book, "Collusion: A Novel." It is about a former Navy SEAL and an FBI agent trying to stop an attempted Russian poison attack against the U.S.
