SHANGHAI (Reuters) -U.S. and Chinese officials traded barbs at a celebration held by a U.S. business chamber in Shanghai on Friday, as the chamber appealed to both countries to provide more certainty to American businesses operating in China.

Scott Walker, consul general of U.S. consulate in Shanghai, told a gathering of U.S. businesses aimed at celebrating the 110th anniversary of the American Chamber of Commerce (AmCham) in Shanghai that the U.S.-China economic relationship had been unbalanced and non-reciprocal "for far too long."

"We want an end to discriminatory actions and retaliation against U.S. companies in China," he said.

In a speech that directly followed Walker's, Chen Jing, a Shanghai Communist Party official who is also the president of the Shanghai People's Association for Friendship with Foreign Countries, countered Walker's view.

"I believe the consul general's view is prejudiced, ungrounded and not aligning with the phone call of our heads of states last night," he said.

The interaction reflects the continued strained relationship between both countries as the trade war continues to simmer.

U.S. President Donald Trump and Chinese leader Xi Jinping spoke over a long anticipated call on Thursday, confronting weeks of brewing trade tensions and a battle over critical minerals. Trump later said they agreed to further talks.

It came in the middle of a dispute between Washington and Beijing in recent weeks over "rare earths" minerals that threatened to tear up a fragile truce in the trade war between the two biggest economies.

The countries struck a 90-day deal on May 12 to roll back some of the triple-digit, tit-for-tat tariffs they had placed on each other since Trump's January inauguration but the deal has not addressed broader concerns that strain the relationship and Trump has accused China of violating the agreement.

Eric Zheng, president of AmCham Shanghai which counts over 1,000 companies among its membership, told reporters on the sidelines of the event that many companies had put their decision-making on pause due to the uncertainty.

"People are looking for some more definitive, durable statements on both sides that enable businesses to feel more secure," he said.

"Our number one ask from the two governments is to give us some certainty so that we can plan accordingly."