President Trump railed against Xi Jinping in a late-night social media post days ahead of their planned call, complaining that the Chinese leader is “extremely hard to make a deal with” as trade talks stall.

In May, the United States and China reached a preliminary trade deal—as Trump lowered his 145 percent tariffs to 30 percent, while Beijing slashed levies on U.S. imports to 10 percent. That came with a 90-day deadline to reach a broader trade deal, but it looks like there’s been little progress since then.