A Meta whistleblower told US senators on Wednesday that the company undermined national security in order to build a $18 billion business in China.

At a congressional hearing, Sarah Wynn-Williams, a former global public policy director at Facebook, said she watched as executives decided to provide the Chinese Communist Party‬ with access to the data of Meta users, including that of Americans.

During her testimony before a Senate judiciary subcommittee, Ms Wynn-Williams also alleged the parent company of Facebook and Instagram worked “hand in glove” with Beijing to build censorship tools aimed at silencing critics of the Chinese Community Party.

Specifically, she said Meta capitulated to China’s demands that it delete the Facebook account of Guo Wengui, a Chinese dissident living in the US.