WASHINGTON — Secretary of State Mike Pompeo, in remarks laying out the Donald Trump administration’s “Plan B” after its exit from the Iran nuclear deal, said today the United States would rally the world to impose crippling economic pressure on Iran to force it to end all enrichment forever, halt its support for military proxy groups, curb its missile program and withdraw its military advisers from Syria, among other demands.

But America’s new top diplomat did not explain how the United States would persuade deeply skeptical and wary international allies and partners to endorse the kind of “maximum pressure” campaign that would threaten the Iranian regime’s survival and possibly foment regime change.

“Iran will be forced to make a choice: either fight to keep its economy off life support at home or keep squandering precious wealth on fights abroad,” Pompeo said in remarks to the conservative Heritage Foundation, in his first major foreign policy address since he became secretary of state last month. “It will not have the resources to do both.”

Pompeo said the United States would not help European allies, Russia and China in their current frantic efforts to keep Iran in the 2015 nuclear deal after Trump withdrew from it on May 8. And he signaled, as national security adviser John Bolton has previously, that the Trump administration would not be inclined to offer waivers or exemptions on US secondary sanctions that are being phased in over the next few months.