Starting in 2017, China carried out a sweeping crackdown in its northwest Xinjiang region under the banner of counterterrorism. It was a harsh campaign to forcibly assimilate the Uyghur population, a mostly Muslim ethnic minority group native to Xinjiang.

Scholars estimate that Chinese authorities detained more than 1 million Uyghurs in centers and reeducation camps for periods ranging from weeks to years. The abuses drew international condemnation, including accusations of genocide and a sweeping U.S. ban on some imports from Xinjiang.

Now, President Biden has said that he is considering a diplomatic boycott of the 2022 Winter Olympics in Beijing as a way to protest human rights abuses in China, including against the Uyghurs.

“We have serious concerns about the human rights abuses we’ve seen in Xinjiang,” White House press secretary Jen Psaki said at a briefing Thursday after Biden’s remarks.