"This spring, the House of Representatives and the Senate agreed to spend $15.5 million to develop a nuclear bunker-buster called the "Robust Nuclear Earth Penetrator." They also agreed to spend money to make changes to the Nevada Test Site, shortening to as little as 18-24 months the time it would take to resume nuclear tests. (It would take 24-36 months now.)
Congress is hung up on just one element of the Bush plan: a ban on researching and developing a nuclear bomb with a payload of 5 kilotons or less. (A kiloton is equivalent to the explosive force of 1,000 tons of TNT.) The Senate voted to end the ban, while the House voted to keep it; the two sides are expected to settle their differences in a House-Senate conference committee by August."