Sarah Wynn-Williams, a former Facebook employee who alleged misconduct and sexual harassment at the company in a memoir published last month, will testify before Congress on Wednesday that Meta executives undermined U.S. national security and briefed Chinese officials on emerging technologies like artificial intelligence.

In her introductory statement, obtained by NBC News, Wynn-Williams will tell the Senate Judiciary Subcommittee on Crime and Counterterrorism that Meta executives “lied about what they were doing with the Chinese Communist Party to employees, shareholders, Congress, and the American public.”

“I saw Meta executives repeatedly undermine US national security and betray American values,” she will say, according to the prepared remarks. “They did these things in secret to win favor with Beijing and build an $18 billion dollar business in China.”

Wynn-Williams, a former New Zealand diplomat, worked at Facebook from 2011 to 2017. She believes she was fired in 2017 as retaliation for accusing her boss, Joel Kaplan, who at the time was a vice president for global public policy, of sexual harassment. Meta, which owns Facebook, said an investigation cleared Kaplan in 2017 and said Wynn-Williams’ book, “Careless People,” contained “false accusations about our executives.” Meta also said other claims contained in the book were “out-of-date and previously reported,” and a former supervisor said she was fired for performance reasons.

Wednesday’s hearing is an indication of the scrutiny that Meta continues to receive in Washington, despite a monthslong effort by Meta and its CEO, Mark Zuckerberg, to pivot the company’s politics to the right, aligning more closely with the Trump administration and the Republican-controlled Congress.