(Bloomberg) — President Donald Trump lashed out at China for what he said is its unwillingness to buy American agricultural products and said it continues to “rip off” the U.S., just as the two nations resumed negotiations in Shanghai following a three-month breakup.

“China is doing very badly, worst year in 27 — was supposed to start buying our agricultural product now — no signs that they are doing so,” Trump said Tuesday on Twitter. “That is the problem with China, they just don’t come through.”

Departing the White House later for Jamestown, Virginia, Trump told reporters “we’re either going to make a great deal or we’re not going to make a deal at all.”

Trump said later Tuesday that he had spoken recently with Chinese President Xi Jinping without elaborating on when or the substance of the discussion.

Trump said Beijing is willing to make concessions in trade talks but he’s not sure if he will accept them and that the decision on reaching a deal is up to him, not his Chinese counterparts.

China’s state media refuted Trump’s comments without naming him. China has no motive to ‘rip off’ the U.S. and hasn’t done so, the People’s Daily, the Communist Party’s flagship newspaper, said in a commentary. The U.S. seemed to have forgotten that it pledged to “restart negotiations on a basis of equality and mutual respect,” instead only hoping to threaten China into make concessions, a tactic which will ultimately fail, it said.

Stocks slid earlier in the day after Trump criticized China and the S&P 500 Index closed lower for a second day.

Trump said that the U.S. has “all the cards” and warned that if he’s re-elected in 2020 China faces a much tougher deal. He said “they always change the deal in the end to their benefit,” adding that “they should probably wait out our Election to see if we get one of the Democrat stiffs like Sleepy Joe.” That’s a reference to Democratic presidential candidate, former Vice President Joe Biden.

Financial markets are on edge about the fate of talks between the world’s largest economies and a two-day Federal Reserve meeting that started Tuesday. The U.S. central bank is expected to lower interest rates for the first time in more than a decade, partly because trade war concerns are slowing business investment.

U.S. delegates including Treasury Secretary Steven Mnuchin and Trade Representative Robert Lighthizer arrived in Shanghai to begin another round of talks with their Chinese counterparts. The Americans attended a dinner at the Fairmont Peace Hotel on Tuesday evening, and talks are scheduled to pick up again on Wednesday in China’s bustling port city.

Expectations for a breakthrough in the trade talks remain low. The two sides are further apart than they were three months ago, when negotiations broke down and each side blamed the other for derailing attempts to reach a deal. China is pushing for compromise in the talks, with state media underlining this week that the U.S. should meet it “halfway.”

The Shanghai talks should help determine whether China will resume negotiations from a draft text agreed before the impasse in May, “or wait for the 2020 election, or do they have some other proposal to make,” Michael Pillsbury, director of the Center on Chinese Strategy at the Hudson Institute, said on Bloomberg TV on Tuesday in Washington. “This could be real suspense.”

Soybean Sales

It’s unclear what triggered Trump’s latest outburst. U.S. soybean exports to China slumped in the first half of the year to the lowest level in more than a decade, while pork sales in June slipped from a month earlier.

China has said the purchase of American farming products will be contingent on the U.S. following through on Trump’s pledge to allow American companies to resume sales to Huawei Technologies Co. Speaking to reporters at an event in Sao Paulo on Tuesday, Commerce Secretary Wilbur Ross said he’s received more than 50 applications for special licenses for companies do business with Huawei, and that he and Trump met with “supply chain” representatives last week.

The administration put the Chinese telecommunications giant on a trade blacklist in May, which means American firms need a special license issued by the Commerce Department to ship to the company.

(Updates with China state media comments.)

–With assistance from Philip Glamann, Emma Dong, Charlie Zhu, Aline Oyamada and Miao Han.

To contact the reporters on this story: Terrence Dopp in Washington at tdopp@bloomberg.net;Justin Sink in Washington at jsink1@bloomberg.net

To contact the editors responsible for this story: Kasia Klimasinska at kklimasinska@bloomberg.net, ;Margaret Collins at mcollins45@bloomberg.net, Justin Blum, Joshua Gallu

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