Questions remain over the disappearance of FBI informant in Russia
Wall Street Journal reporter Brett Forrest spoke with ABC News Live about his new book that looks at the disappearance of Billy Reilly. The detentions of U.S. citizens, like reporter Evan Gershkovich, Brittney Griner and Paul Whelan by Russia, has kept tensions between the U.S. and Russia high as the war in Ukraine rages on. Wall Street Journal national security reporter Brett Forrest has taken a look at another case, the 2015 disappearance and murder of Billy Reilly, an FBI informant in his new book, "Lost Son: An American Family Trapped Inside the FBI Secret Wars." Forrest spoke about the case and his book with ABC News Live Monday. The FBI didn't immediately comment on the book and Forrest's reporting. Wall Street Journal reporter Brett Forrest speaks to ABC News about his book "Lost Son." ABC News ABC NEWS LIVE: So your book dives into the post 9/11 world and the FBI's Confidential Human Source program. Explain what that program is and how Billy R...