People close to Robert Mueller believe "something happened" to the former special counsel over the course of his two-year Russia investigation, according to a reporter. The Washington Post's Carol Leonnig, who is the co-author of the new book A Very Stable Genius about President Trump, described on Tuesday how difficult it was for some of Mueller's close family friends to watch his shaky testimony before Congress last summer.“Phil [Rucker] and I, my co-author, we are not medical professionals, but over and over again, John, we heard from people who are very close to Bob Mueller who found him a different...