In June, the two countries reached an agreement to ease tensions. The United States said it would pull back export restrictions on computer chip technology and ethane, a feedstock in petrochemical production. And China agreed to make it easier for U.S. firms to get access to rare earths.

“I have just signed an Executive Order that will extend the Tariff Suspension on China for another 90 days. All other elements of the Agreement will remain the same,” Trump wrote. The new deadline will expire on Nov. 9. at 12:01 a.m.