WASHINGTON — The leaders of three Republican House committees threatened Monday to hold Democratic fundraising powerhouse ActBlue in contempt of Congress after the firm refused to turn over more than 400 documents, citing attorney-client privilege. A letter from House Administration Committee Chairman Bryan Steil (R-Wis.), Judiciary Committee Chairman Jim Jordan (R-Ohio), and Oversight Committee Chairman James Comer (R-Ky.) gave ActBlue until Friday to provide the messages, including statements by two members of its legal team indicating the fundraiser was not being forthcoming about overseas donations that were illegally funneled to Democratic campaigns. “These documents reportedly contain evidence that ActBlue accepted...