WASHINGTON -- The Trump administration has determined that China has committed “genocide and crimes against humanity” by repressing Uighur Muslims in its Xinjiang region, U.S. Secretary of State Mike Pompeo said on Tuesday, in an embarrassing blow to Beijing a day before President-elect Joe Biden is set to take office.

Pompeo said he made the move - which is certain to further strain already frayed ties between the world’s top economies - “after careful examination of the available facts,” accusing the Chinese Communist Party of crimes against humanity targeting the Uighurs and other Muslim minorities since at least March 2017.

“I believe this genocide is ongoing, and that we are witnessing the systematic attempt to destroy Uighurs by the Chinese party-state,” Pompeo said in a statement.

China has been widely condemned for its complexes in Xinjiang, which it describes as “vocational training centers” to stamp out extremism. It denies accusations of abuse.

The rare American determination follows intensive internal debate after Congress passed legislation on Dec. 27 requiring the U.S. administration to determine within 90 days whether China had committed crimes against humanity or a genocide.

Biden’s nominee for secretary of state, Antony Blinken, told the Senate Foreign Relations Committee during a confirmation hearing on Tuesday he agreed with the genocide declaration.

He said the United States should not be importing any products made with forced labor from Xinjiang, adding: “We need to make sure that we’re also not exporting technologies and tools that could be used to further their repression.”

China’s embassy in Washington said in a statement: “The so-called ‘genocide’ in Xinjiang is simply a lie. It is a farce used to discredit China.” It rejected the U.S. declaration as a “gross interference in China’s internal affairs.”

U.S.-China ties plummeted to their lowest level in decades during Republican President Donald Trump’s administration, and the genocide declaration will ensure an especially difficult start to the Biden administration’s relationship with Beijing.

Accountability

The U.S. decision does not automatically trigger any penalties, but means countries will have to think hard about allowing companies to do business with Xinjiang, a leading global supplier of cotton. Last week, Washington imposed a ban on all cotton and tomato products from Xinjiang.

In his statement, Pompeo called “on all appropriate multilateral and relevant juridical bodies, to join the United States in our effort to promote accountability for those responsible for these atrocities.”

The International Criminal Court can investigate crimes of genocide, war crimes and crimes against humanity, but China - like the United States - is not a court member, so the situation in Xinjiang would have to be referred by the U.N. Security Council, where China could veto such a move.

An independent U.N. human rights panel said in 2018 that it had received credible reports that at least 1 million Uighurs and other Muslims had been detained in Xinjiang. Faith leaders and activists have said crimes against humanity, including genocide, are taking place.