Washington's trade investigations target 60 economies including China and will look into "failures to take action on forced labor" and whether these burden or restrict US commerce.

Those investigations came a day after a separate set of US probes centred on excess industrial capacity that target 16 trading partners including China, which Beijing's foreign ministry criticised as "political manipulation".

"We urge the US side to immediately correct its erroneous ways, meet China halfway... and resolve issues through dialogue and negotiations," Beijing's commerce ministry said in a statement.

The latest round of investigations "is extremely unilateral, arbitrary and discriminatory", it said, accusing Washington of "attempting to construct trade barriers".

Trade officials from both countries met in Paris on Sunday for talks that Washington has said would last for two days.

China has "lodged representations" with the US over the newest forced labour trade probes, the Chinese commerce ministry said.

Human rights groups and United Nations experts have voiced alarm over allegations of forced labour affecting minority groups in China's western Xinjiang region, which Beijing has dismissed as "fabricated".

The two sets of trade probes will likely take months, but could justify new tariffs after the US Supreme Court struck down President Donald Trump's sweeping tariffs in February.

Washington has said Trump will visit China from March 31 to April 2, although Beijing has yet to confirm those dates.

Trump told the Financial Times in an interview that the summit could be postponed because of the Middle East war.