The Obama administration is moving toward decisions that would further cut the number of U.S. nuclear weapons, possibly to between 1,000 and 1,100, reflecting new thinking on the role of nuclear weapons in an age of terror, current and former officials say. The reductions under consideration are in line with President Barack Obama's vision of trimming the nation's nuclear arsenal without harming national security in the short term, and in the longer term, eliminating nuclear weapons.