WASHINGTON — President Trump, emboldened by a strong American economy and wary of criticism that an evolving trade deal with China would not adequately benefit the United States, threatened on Sunday to impose more punishing tariffs on Chinese goods in an attempt to force additional concessions in a final agreement.

Mr. Trump, in a tweet, warned that he would increase tariffs on $200 billion in Chinese goods at the end of this week and “shortly” impose levies on hundreds of billions of dollars of additional imports. Dozens of high-level Chinese officials are arriving in Washington this week for what was expected to be a final round of negotiations toward a trade agreement, at least in principle.

Mr. Trump’s threat caught Chinese officials by surprise. On Monday morning in Beijing, they were trying to decide whether Vice Premier Liu He should go ahead with his visit later this week to Washington, said people familiar with the talks who insisted on anonymity because they were not authorized to comment publicly on the negotiations.

President Trump’s tweets come after Chinese officials took a tough line in high-level trade negotiations last week in Beijing, two of the people said. Chinese negotiators said they were reluctant to make any agreement that would require China’s legislature to approve changes to current law. The legislature in March already approved a new foreign investment law that added protections for foreign companies who fear they will be forced to transfer their technology and know-how to Chinese firms, but business groups and Trump administration officials said it didn’t go far enough.