At a hearing in Iraq on January 11, 2007, United States Senator Joseph Biden, chairman of the Senate Foreign Relations Committee, told Rice that the Bush Administration did not have the authority to send American troops on cross-border raids. Biden said, "I believe the present authorization granted the president to use force in Iraq does not cover that, and he does need congressional authority to do that. I just want to set that marker". Biden sent a follow-up letter to the White House asking for an explanation on the matter.