In this June 28, 2016 photo, then-Deputy Attorney General Sally Yates speaks during a news conference at the Justice Department in Washington. An Obama administration official who warned the Trump White House about contacts between Russia and one of its key advisers is set to speak publicly for the first time about the concerns she raised. Yates is testifying May 8, 2017 before a Senate Judiciary subcommittee investigating Russian interference in the 2016 presidential election. Photo: AP Photo — J. David Ake, File   / Copyright 2016 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistribu