Senator Charles Grassley

Senator Charles Grassley

Senator Charles Grassley, a Republican from Iowa, is reviewing whether authorities improperly accelerated the Reston, Virginia-based company’s partial approval last year. LightSquared’s plans to bring high-speed data service to as many as 260 million people need clearance from U.S. officials, who are weighing test results showing interference with the global-positioning system. Photo: Brendan Hoffman/Bloomberg