New Delhi, June 15 -- EVIAN-LES-BAINS, France - He is sitting 300 miles from Geneva. The G7 ends June 17, two days before the ceremony. Air Force One could make the detour in under an hour. And yet, when reporters asked Donald Trump on Monday whether he intended to attend the signing of the Iran memorandum of understanding on June 19, the president of the United States who has called the deal the greatest diplomatic achievement of his life declined to give a straight answer.

"Well, it depends. JD is coming in for it," Trump told a joint press conference with French President Emmanuel Macron on the margins of the G7 summit in Evian-les-Bains, adding that he will "likely be back in the US" but not ruling out a personal appearance. JD Vance...