The U.S. Commerce Department on Monday announced further restrictions on Huawei Technologies Co. aimed at cutting the Chinese company’s access to commercially available chips, the latest move in an increasingly tense relationship between Beijing and Washington.

The changes build on restrictions announced in May, adding 38 Huawei affiliates in 21 countries to an economic blacklist as the U.S. seeks to limit adoption of the company’s 5G technology.

“We don’t want their equipment in the United States because they spy on us,” President Trump said Monday in an interview on “Fox and Friends.”

The move is the latest tit-for-tat in escalating tensions between Washington and Beijing over issues including the origins of the COVID-19 pandemic as well as China’s increasingly tight grip over Hong Kong. Despite the U.S. decision, Commerce Secretary Wilbur Ross said on Fox Business that talks with China continued on various levels.

Ross said the action was aimed at closing loopholes the company explored after previous U.S. actions. Secretary of State Michael Pompeo praised the move as a “direct blow” against the Chinese Communist Party.

Huawei has long rejected accusations that its technology can be used to spy on foreign nations or companies.