A Real Downside to Any Deal With Iran

Israeli Prime Minister Benjamin Netanyahu caused a stir last week when he blasted President Barack Obama’s attempt to negotiate a nuclear deal with Iran. American television media covered little else for 24 hours. The prime minister and the president are still bickering about it this week on Twitter. Both have ignored a disturbing reality: any deal with Iran, good or bad, is likely to benefit ISIS.

President Obama is pursuing an agreement for understandable reasons. Far better to resolve the W...