The U.S. Department of Justice has sued former gaming executive Steve Wynn for not registering as a foreign agent, alleging he lobbied former President Donald Trump and members of his administration on behalf of the Chinese government when he was chairman and CEO of Wynn Resorts.

In a statement, Justice Department officials said Wynn, who resigned his position at Wynn Resorts in 2018 amid sexual misconduct allegations, had been repeatedly advised to register as a foreign agent on behalf of China over the last four years but declined.

The complaint, filed Tuesday in federal court in Washington, D.C., alleged Wynn contacted Trump and administration members between June 2017 and August 2017 on behalf of the Chinese government, which was seeking to return a Chinese national to its country.