Chinese Vice Premier Liu He will travel to the U.S. for trade talks scheduled for May 9 and May 10, at the invitation of U.S. Trade Representative Robert Lighthizer and Treasury Secretary Steven Mnuchin, state-run Xinhua News Agency reported Tuesday.

One day earlier, U.S. president Donald Trump threatened China with higher tariffs while claiming China’s attempts to re-negotiate might affect the talks’ progress.

A spokesperson for China’s Ministry of Foreign Affairs later said a Chinese delegation was in preparation to travel to the U.S. for the talks, without specifying any delegates.

Yesterday, China’s stock markets experienced their biggest drop in more than three years, as investors worried about potential new U.S.-China trade tensions and also pocketed gains from a strong bull market at the start of the year.

Related: China Stocks Post Biggest Drop in More Than Three Years