A former U.S. Marine pilot fighting extradition from Australia on U.S. charges of training Chinese military pilots to land on aircraft carriers unknowingly worked with a Chinese hacker, his lawyer said.

Daniel Duggan, 55, a naturalized Australian citizen, feared requests by Western intelligence agencies for sensitive information were putting his family at risk, the lawyer said in a legal filing.

The lawyer's filing supports reports linking Duggan to convicted Chinese defense hacker Su Bin.