The art of a 2nd Iran deal

President Donald Trump’s first 100 days, which he celebrated this week with a characteristically electric campaign-style rally in Michigan, were the fastest and most frenzied 100 days in modern presidential history. And if Thursday’s presidential personnel drama is any indication, the next 100 days could offer more of the same.

On Thursday, embattled Trump administration National Security Adviser Mike Waltz and Deputy National Security Adviser Alex Wong resigned their posts. Reading the not-so-subtle tea leaves out of Washington...