Trump Leaves the Hard Part for Later in Long-Awaited Iran Deal

The US and Iran needed more than two months of fitful, strained negotiations to agree on a deal to halt their fighting and reopen the Strait of Hormuz. Now comes the hard part.

The provisional agreement announced by the two sides on Sunday night — President Donald Trump’s 80th birthday — leaves a narrow window of 60 days to negotiate issues around Iran’s nuclear program that bedeviled his predecessors for years. The memorandum of understanding, which has yet to be released, will be formally signed on June 19.

That gap raised the possibility that details on the text remained ...