President Donald Trump's campaign to beef up the Iran nuclear deal is forcing diplomats to address thorny issues that negotiators tabled during years of diplomacy to prevent Iran from developing an atomic weapon.
Those issues are now being addressed in high-stakes talks between Europeans, who are intent on preserving the accord, and the Trump administration, which believes the agreement is fundamentally flawed. The parties face a deadline in May imposed by Trump.
Americans and Europeans always intended to revisit those issues at some point, sanctions experts say. But the hard line adopted by the president has forced the trans-Atlantic partners to revisit them sooner than many expected.
Now, Europeans and Americans are racing to resolve their differences. Earlier this year, Trump said he will refuse to waive sanctions against Iran in May if his administration cannot reach an agreement with Europe.