Abbas Milani, a research fellow and codirector of the Iran Democracy Project at the Hoover Institution, discusses ISIS, Iran, Saudi Arabia, and the future of the Middle East. Successive US administrations have declared Iran to be one of America’s most serious national security threats. Yet the last four wars the US has fought in the region — in Afghanistan, in the two wars in Iraq and in the current war with ISIS—have resulted in either removing or containing Iran’s powerful adversaries.