A Chinese delegation will come to the U.S. this week for trade talks after President Donald Trump upended negotiations by threatening new tariffs on Sunday, according to sources familiar with the matter.

One of the sources briefed on the status of talks said the Chinese would send a smaller delegation than the 100-person group originally planned. It is unclear whether Vice Premier Liu He would still helm this smaller group, an important detail if the team were traveling to Washington with an eye toward sealing a deal. Two senior administration officials described Liu as "the closer," since he had been given authority to negotiate on President Xi Jinping's behalf.

The team from Beijing was set to start talks with American negotiators on Wednesday as the world's two largest economies push for a trade agreement. It is unclear whether the talks will still start Wednesday.

The White House, Treasury Department and Office of the U.S. Trade Representative did not immediately respond to requests to comment.