U.S. President Donald Trump speaks about Iran and the Iran nuclear deal, October 13, 2017.
Kevin Lamarque / Reuters

After a year of complaining about the Iran nuclear deal, formally known as the Joint Comprehensive Plan of Action (JCPOA), U.S. President Donald Trump finally resorted to threats. In January, he gave Congress and Europe an ultimatum: if they did not fix what he considered the agreement’s shortcomings by May, he would kill the deal.

Trump’s chief objection is that certain restrictions on Iran’s nuclear program expire, or “sunset,” after 10–15 years. He has also raised concerns about Iran’s support for Hezbollah in Lebanon and various Shiite militia groups in Iraq, Syria, and Yemen, and has

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