U.S. officials said Tuesday they are willing to negotiate a treaty on the use of cluster bombs, reversing their position that no new agreement on the weapon was necessary. But the United States still rejects a proposed global ban on the weapon, which 46 countries began negotiating in Oslo in February, officials said. Instead, Washington wants to negotiate a treaty that doesn’t go as far within the framework of the 1980 U.N. Convention on Conventional Weapons. Full Story