Today, Iranian President Mahmoud Ahmadinejad will speak to the United Nations General Assembly. He will make predictably odious statements, and they will be seized upon by conservatives in the U.S. as evidence that the U.S. should abandon its policy of engaging the Iranian regime. These critics should be ignored. Conservatives who argue for abandoning engagement are stuck in the failed policies of the past: unilateral and unrealistic sanctions, useless saber-rattling, and wild notions of regime change. This stance defies the opinions of top military leaders and leading Iran experts. While the U.S. must be ready to deploy internationally backed pressure if needed, the best means forward with Iran is to stay committed to the policy of engagement.