Sen. Lindsey Graham, R-S.C., called on Congress to set up a special committee to investigate the Obama administration’s response to the Sept. 11, 2012, attack on a U.S. diplomatic post in Benghazi, Libya.

Several congressional panels have held Benghazi-related hearings since 2012. But Graham said that because of the case’s complexities and the Obama administration’s reluctance to cooperate with Congress, a new, bipartisan joint House-Senate “select committee” is needed to coordinate what has been a mostly Republican investigation.