WASHINGTON — Nearly two years after it was created, the House Benghazi Committee is plowing ahead — interviewing witnesses, reviewing documents and promising a final report “before summer” that is certain to have repercussions for Democrat Hillary Clinton’s bid for the presidency. The panel’s Republican chairman, Rep. Trey Gowdy of South Carolina, said in an email to The Associated Press that the committee has made “considerable progress” investigating the deadly 2012 attacks that killed four Americans, including the U.S.