Former Wynn Resorts Ltd. CEO Steve Wynn could face a trial next year over his failure to register as a Chinese lobbyist, according to a Tuesday filing in U.S. District Court for the District of Columbia.

The Justice Department first filed a lawsuit in May against Wynn to force him to register as a foreign agent, after making repeated requests. The government accused him of delivering a message to then-President Donald Trump on behalf of a Chinese government official. Wynn has argued that he wasn’t lobbying when he told the Trump administration that China wanted the U.S. to extradite Guo Wengui, an exile who has criticized the Chinese government.