As President Trump prepares to meet with Xi Jinping, a trade war that once threatened to freeze commerce between the two countries has given way to an uneasy truce.

But Trump landed stateside Friday with seemingly no progress to report.

Then Trump held a gaggle with reporters aboard Air Force One on the trip back home, where he said he and Xi did discuss a pending $14 billion arms sale to Taiwan, and that Trump would “make a determin...