The U.S. will bar entry of all cotton products and tomatoes from China’s Xinjiang region, where it says Beijing is oppressing Muslim-minority Uighurs.

The move is the latest in a series of actions where the U.S. is raising pressure on China over some companies’ alleged ill-treatment of workers. The U.S. says the Chinese government has detained more than 1 million Uighurs and other ethnic and religious minorities in "re-education” internment camps, allegations that the Foreign Ministry in Beijing denies.

"Forced labor is a form of modern slavery,” Acting Department of Homeland Security Deputy Secretary Kenneth Cuccinelli said on a call with reporters Wednesday. "‘Made in China’ doesn’t just indicate country of origin — it’s a warning label.”