A Defense Department official is pushing back against a bill to place new restrictions the president's ability to transfer terror suspects out of the prison at Guantanamo Bay, Cuba.

Brian McKeon is principal deputy undersecretary of defense for policy. McKean told the Senate Armed Services Committee Thursday that the bill proposed by four powerful GOP senators would effectively ban most transfers from Guantanamo for two years. He says it would block progress toward the goal of closing the detention center.

The senators are Kelly Ayotte of New Hampshire, John McCain of Arizona, Richard Burr of North Carolina and Lindsey Graham of South Carolina.

Nearly a dozen protesters dressed in orange jumpsuits and T-shirts reading "Shut down GITMO" attended the hearing. One started yelling and was escorted out.