In his May 21 speech at the Heritage Foundation , the new U.S. Secretary of State, Mike Pompeo, defended Trump’s decision earlier this month to violate the 2015 multilateral nuclear deal with Iran, withdraw from the agreement, and pursue a “better deal.” But the Trump administration’s vision of a “better deal” with Iran is like a mirage in the desert—it may look good, but it is not real and there is no path to get there. And by trying to, the United States only risks the deal at hand. What Pompeo failed to articulate is how that “better deal” is possible, given that key U.S. allies and...