WASHINGTON -- President Bush's plan for the Navy calls for buying fewer ships, while China, a potential security hot spot, is increasing and repositioning its fleet. It's a prospect that concerns some lawmakers. The plan is contained in Bush's 2006 budget proposal, which Defense Secretary Donald H. Rumsfeld on Thursday defended, saying the military was closely watching China's moves but that the U.S. Navy remains the pre-eminent fleet. "The United States Navy ... is the Navy on the face of the Earth that is a true blue water navy," Rumsfeld told the Senate Armed Services Committee. "On the other hand,...