The panel’s chairman, Rep. Trey Gowdy of South Carolina, and other Republicans accuse the Obama administration of stonewalling important documents and witnesses. Democrats say the panel’s primary goal is to undermine Hillary Clinton’s presidential bid.

Clinton was secretary of state during the attacks, which killed four Americans, including U.S. Ambassador Chris Stevens.

Democrats released a report Monday stating that Clinton never personally denied any requests from diplomats for additional security at the U.S. outpost in Benghazi. Democrats said after a two-year investigation that the military could not have done anything differently that night to save the lives of four Americans killed in Libya.

Democrats’ release of their own report heightened the partisanship of the inquiry, which has been marked by finger-pointing on both sides.