Obama supports tough, direct presidential diplomacy with Iran without preconditions. Now is the time to pressure Iran directly to change their troubling behavior. Obama and Biden will offer the Iranian regime a choice. If Iran abandons its nuclear program and support for terrorism, we will offer incentives like membership in the World Trade Organization, economic investments, and a move toward normal diplomatic relations. If Iran continues its troubling behavior, we will step up our economic pressure and political isolation. Seeking this kind of comprehensive settlement with Iran is our best way to make progress.