A Taiwan-born Navy officer who became a naturalized U.S. citizen faces charges of espionage, attempted espionage and prostitution in a highly secretive case in which he is accused of providing classified information to China, U.S. officials said.

The Navy examined the charges against Lt. Cmdr. Edward C. Lin in a preliminary military justice hearing Friday. The service did not release his identity, but a U.S. official disclosed it Sunday on condition of anonymity.

The Navy said the officer is assigned to the headquarters for the Patrol and Reconnaissance Group, which oversees maritime patrol aircraft such as the P-8A Poseidon and P-3C Orion spy planes and the MQ-4C Triton surveillance drone.

A charge sheet released by the Navy said the officer is accused of communicating secret information “with intent or reason to believe it would be used to the advantage of a foreign nation,” hiring a prostitute for sex, committing adultery, not disclosing foreign travel to the U.S. government as required, and lying about it after the fact.