Why are the Republicans stopping START? - The Week Republican lawmakers are blocking a push by the Obama administration to get a major nuclear arms treaty ratified this year. The Strategic Arms Reduction Treaty (START) was signed by Obama and Russian President Dmitri Medvedev back in April. The deal, which needs to be aproved by the Senate, would cut both countries' nuclear stockpile by about 30 percent. But Sen. Jon Kyl (R-AZ), the GOP point man on the issue, said he does not want to schedule a vote during the lame-duck session of Congress because there's not enough time to overcome complex and unresolved issues. What's behind the delay?