Nearly two years after it was created, the House Benghazi Committee is still plowing ahead.

It's interviewing witnesses, reviewing documents and promising a final report "before summer" that is certain to have repercussions for Democrat Hillary Clinton's presidential bid.

The panel's Republican chairman, Rep. Trey Gowdy of South Carolina, says the committee has made "considerable progress" investigating the deadly 2012 attacks that killed four Americans, including the U.S. ambassador to Libya.

Democrats say the only goal of the investigation is to undermine Clinton's candidacy. Clinton was secretary of state at the time of the attacks.

Gowdy declined to be interviewed, but said in a statement that the committee had moved forward in its inquiry in recent weeks after interviewing National Security Adviser Susan Rice and other witnesses.