It's time for the United States to hold Iran accountable.

WASHINGTON— Donald Trump as president will be positioned to swiftly pull the U.S. out of the Obama administration’s landmark nuclear agreement with Iran, as he suggested during his campaign.

A much harder task for Mr. Trump, however, is to convince other global powers to join him and dismantle a deal that President Barack Obama says has diminished the threat of another war in the Mideast and opened a path for reduced tensions in the region.

During his campaign, Mr. Trump said the Obama administration negotiated badly. He alternately said he would scrap the deal and that he would renegotiate its terms. “My number one priority is to dismantle the disastrous deal with Iran,” he told the American Israel Public Affairs Committee in March.

Tehran has been found to have briefly violated its pledges twice since the deal was reached in mid-2015, according to U.S. and European officials. Yet international commitment to the agreement remains strong, and the parties who negotiated it—China, Russia, France, Germany, the U.K. and the U.S.—have pledged to promote it.

European Union foreign ministers are set to reiterate on Monday their strong support for the full implementation of the accord.

The Iran deal isn’t a treaty, wasn’t formally signed, and wasn’t ratified by the U.S. Congress. It was approved by the United Nations Security Council, but not under procedures that obligate member states to observe its terms under threat of penalty.

Any partner—including Iran—could summarily cease to stick to the agreement, which resulted in Tehran scaling back its nuclear capabilities in return for the lifting of most international sanctions.

“The agreement is valid only as long as all parties uphold it,” State Department spokesman Mark Toner said Wednesday.

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