As United Nations officials welcome the Christmas Eve entry into force of the U.N. Arms Trade Treaty (ATT), its progress in the U.S. remains hampered by significant Senate opposition and funding prohibitions included in appropriations legislation. Most recently, the omnibus government funding bill passed by the Congress earlier this month contained new prohibitions on the administration using any funds to implement the conventional arms treaty. Under U.N. procedures the U.S. would be liable for 22 percent of the budget for the ATT secretariat, the body that will oversee its implementation.