House Republicans have named the congressional aide to Rep. Jake Auchincloss, Massachusetts Democrat, who allowed TV’s Stephen Colbert’s comedy crew into one of the House office buildings after hours. Republicans said Tuesday that Auchincloss Chief of Staff Tim Hysom was responsible for letting seven producers and staffers of “The Late Show with Stephen Colbert” back into the House Longworth Building last week after U.S. Capitol Police directed the TV crew to leave the complex earlier in the day. Rep. Rodney Davis, Illinois Republican and ranking member of the House Administration Committee, said he is 100% sure Mr. Hysom is the...