Abstract: President Barack Obama has transmitted a deeply flawed arms control treaty to the Senate for its consent to ratification. While withholding consent is the simplest and most likely approach, the Senate may try to fix the treaty piecemeal, but this approach has inherent, serious risks. Fixing some of the serious flaws will require amendments to the text, and fixing others will require compelling the Administration to change some of its policies. Regardless of what the Senate chooses, the stakes are high.