. . . . . . . . . "Obstruction of justice does the Justice Department have to respond to a lawfully issued and valid congressional subpoena? : hearing before the Committee on Oversight and Government Reform, House of Representatives, One Hundred Twelfth Congress, first session, June 13, 2011"@en . . . . . "Obstruction of justice : does the Justice Department have to respond to a lawfully issued and valid congressional subpoena? : hearing before the Committee on Oversight and Government Reform, House of Representatives, One Hundred Twelfth Congress, first session, June 13, 2011"@en . . . .