washington senator amy klobuchar top democrat senate antitrust panel send letter u.s. justice department friday urge reject effort white house inject politics merger investigations letter follow new york time report say white house advisors battle television news station cnn mull use government review inc plan merge cnn parent time warner inc leverage political interference antitrust enforcement unacceptable even concern instance appear advisers president may believe appropriate government use law enforcement authority alter censor press klobuchar write letter attorney general jeff sessions white house justice department decline comment story klobuchar express concern 85.4 billion megadeal note concern add justice department antitrust review focus consumer welfare rather politics klobuchar also ask sessions report senate judiciary committee antitrust subcommittee white house staffer presidential adviser contact justice department merger president donald trump comment publicly deal since election campaign say example power structure rig much concentration power hand few u.s. senator urge doj reject white house push merger probe