China denies abuses in Xinjiang, a major cotton producer that also supplies much of the world's materials for solar panels.
Its Washington embassy said the act "ignores the truth and maliciously slanders the human rights situation in Xinjiang."
"This is a severe violation of international law and norms of international relations, and gross interference in China's internal affairs. China strongly condemns and firmly rejects it," embassy spokesperson Liu Pengyu said in an emailed statement.
He said China "would respond further in light of the development of the situation," but did not elaborate.
In a statement Friday, China's Ministry of Foreign Affairs expressed its "strong indignation and resolute opposition" to the legislation.
"Claims of 'forced labour' and 'genocide' in Xinjiang are nothing but vicious lies hyped up by anti-China forces," the statement said.
The US is engaging in "political manipulation and economic bullying under the guise of human rights," and is trying to "undermine Xinjiang's prosperity and stability and contain China's development," it added.
Nury Turkel, the Uyghur-American vice-chair of the US Commission on International Religious Freedom, told Reuters this month the bill's effectiveness would depend on the willingness of Biden's administration to ensure it is effective, especially when companies seek waivers.
US Secretary of State Antony Blinken said Biden's approval of the law underscored the "United States' commitment to combating forced labour, including in the context of the ongoing genocide in Xinjiang."
"The State Department is committed to working with Congress and our interagency partners to continue addressing forced labour in Xinjiang and to strengthen international action against this egregious violation of human rights," he said in a statement.
One of the bill's co-authors, Democratic Sen. Jeff Merkley, said it was necessary to "send a resounding and unequivocal message against genocide and slave labour."
"Now ... we can finally ensure that American consumers and businesses can buy goods without inadvertent complicity in China's horrific human rights abuses," he said in a statement.
In its final days in January, the Trump administration announced a ban on all Xinjiang cotton and tomato products.
The US Customs and Border Protection agency estimated then that about $9 billion of cotton products and $10 million of tomato products were imported from China in the past year.
SOURCE: CNNImage Source: Pixabay.com
