Empower Oversight, a group of lawyers including former aides to Senator Charles E. Grassley, Republican of Iowa, is part of a constellation of groups facilitating G.O.P. investigations in Congress.
The demand for interviews with more than a dozen federal officials comes as the G.O.P. hunts for evidence that the government improperly protected the president’s son from felony prosecution.
Leslie Kean helped break the news of a whistle-blower who claims the government possesses materials from a craft of “nonhuman origin.” We discuss her reporting — and what remains unclear.