WASHINGTON — President Trump declared on Tuesday that he was pulling out of the Iran nuclear deal, unraveling the signature foreign policy achievement of his predecessor, Barack Obama, and isolating the United States among its Western allies.
“This was a horrible one-sided deal that should have never, ever been made,” Mr. Trump said at the White House in announcing his decision. “It didn’t bring calm, it didn’t bring peace, and it never will.”
Mr. Trump’s announcement, while long anticipated and widely telegraphed, plunges America’s relations with European allies into deep uncertainty. They have committed to staying in the deal, raising the prospect of a diplomatic and economic clash as the United States reimposes stringent sanctions on Iran .
It also raises the prospect of increasing tensions with Russia and China, which also are parties to the agreement.