 Bradbury's nomination was opposed by a coalition of human rights groups, including the American Civil Liberties Union, Human Rights Watch, Center for Victims of Torture, and the Center for Constitutional Rights.Following a preliminary hearing by the Senate Commerce, Science, and Transportation Committee, Senator Tammy Duckworth announced that she had placed a hold on Bradbury's nomination.The Senate operates by unanimous consent, granting any single Senator the ability to prevent action.