U.S. trade talks with China ended Friday as Liu He, the top Chinese trade negotiator, left the Office of the U.S. Trade Representative.

"They were constructive discussions between both parties, that's all we're going to say. Thank you," Treasury Secretary Steven Mnuchin told CNBC after Liu's departure. Both Mnuchin and U.S. Trade Representative Robert Lighthizer shook hands with Liu, who is China's vice premier, as he left the office in Washington.

The two Trump administration officials were seen entering the White House after the two days of U.S.-China talks ended.

The world's two largest economies engaged in negotiations on Thursday and Friday as they tried to salvage a trade deal that appeared to be within their grasp only a week ago. The U.S. increased tariffs on $200 billion in Chinese goods to 25% from 10% on Friday following what it called China's decision to back out of key commitments to a developing agreement. China has promised to retaliate against the tariffs, but it is unclear what action Beijing would take.