WASHINGTON — House Republicans have issued a subpoena demanding testimony from Secretary of State Antony Blinken as they wrap up a sprawling yearslong investigation into the chaotic U.S. withdrawal from Afghanistan in August 2021. Rep. Michael McCaul , the chairman of the House Foreign Affairs Committee, sent a subpoena letter late Tuesday ordering Blinken to appear before the committee by Sept. 19 or face a contempt of Congress charge. “You served as the final decision maker for the department