An arms control deal with Moscow halving superpower strategic weaponry would be far more effective than a first phase "Star Wars" defense program, the report said. Noting that SDI would intercept only 16 percent of Soviet warheads, the senators added, "In stark contrast, even the (trategic Arms Reduction Treaty) framework for 50 percent warhead reductions that the Soviets have already agreed to in Geneva would be more effective than Phase I in reducing the future threat," the senators said. ~