Iran’s so-called “Supreme Leader,” Ayatollah Ali Khamenei, was reportedly persuaded to talk with the Trump administration about a new nuclear deal after being told by advisers that the regime could collapse if he did not. Khamenei had previously rejected talks with Trump. But with Trump’s “maximum pressure” campaign of sanctions, his military action against the Iranian-backed Houthis in Yemen, and Israel’s destruction of Iran’s air defenses last year, Khamenei’s advisers appear to have believed that the regime was on the ropes. The New York Times reported Friday: Mr. Khamenei had publicly and repeatedly banned engaging with Washington, calling it unwise...