President Donald Trump said he called off last weekend’s trade talks with China, raising questions about the future of a trade deal that is now the most stable point in an increasingly tense relationship.

“I canceled talks with China,” Trump said Tuesday in Yuma, Arizona. “I don’t want to talk to China right now.”

The phase-one trade deal, which came into force in February, had called for discussions on implementation of the agreement every six months. Chinese Vice Premier Liu He was supposed to hold a video conference call with U.S. Trade Representative Robert Lighthizer and Treasury Secretary Steven Mnuchin, but it was postponed indefinitely.

While China is making many of the structural changes it promised on issues such as intellectual property protection, its purchases of U.S. goods are well below where they need to be to meet promised targets, and there’s almost no chance they can be fulfilled now with the damage Covid-19 has done to the global economy. A collapse of the deal risks leading to a return of the tit-for-tat tariff war that hurt trade and companies around the world.

Addressing whether the U.S. would pull out of the phase-one deal, Trump said: “We’ll see what happens.” Terminating the deal would require a written notification and take effect 60 days later, unless both parties agree on a different date.

The talks never made it on to any official public calendar in Washington or Beijing, but the South China Morning Post reported that they were set for last Saturday. Earlier, Chinese foreign ministry spokesman Zhao Lijian said that information on high-level talks will be released “in due course.”

China Is Buying American But Not Enough to Hit Trade Deal Target

Trump has stepped up pressure on China over everything from democracy in Taiwan and Hong Kong to popular apps WeChat and TikTok as he looks to make up ground in the polls before the November election. One of his main goals with the trade deal was to lower the U.S. deficit with China, but now it’s rising again.

Even if China can buy enough soybeans, corn or pork to meet its promises on agriculture, it’s unlikely it can buy enough oil and gas to meet the promises on energy. In addition, the collapse of international travel will hit Chinese demand for new U.S. planes and has stopped hundreds of thousands of Chinese citizens from traveling to the U.S. for college or tourism, decimating U.S. services exports.

Trump has been stepping up complaints about China, particularly over the spread of the coronavirus, which he regularly calls the “China Virus.”

“What China did to the world was unthinkable,” Trump said Tuesday.