Beijing announced tariffs on Tuesday on some American imports including crude oil, agricultural machinery and liquefied natural gas, in retaliation for the Trump administration’s imposition of 10% tariffs on Chinese imports into the United States.

Lighthizer, who campaigned with President Trump, serves as an unofficial adviser. He was reportedly passed over for Treasury secretary, but he remains close to the president. Lighthizer says U.S. trade with China has largely benefited an adversary who has engaged in stealing trade secrets and other malicious actions.