James Kaufman has been trying for six years to renounce his citizenship, pressing Justice Department officials and other government agencies to let him cut his ties to the United States.

Kaufman, a 36-year-old registered sex offender who is locked up in state prison in Wisconsin, says in court papers in Washington that he is entitled to renounce his citizenship inside the United States during a state of war. Typically, a person can only renounce citizenship outside of the United States.