WASHINGTON (AP) — In another case of the Obama administration investigating classified information improperly disclosed to reporters, the government is prosecuting a State Department expert on North Korea in a probe that appears to step into uncharted territory — by declaring that a journalist is committing a crime in disclosing leaked information.

During the investigation of State Department adviser Stephen Kim, law enforcement officials obtained a search warrant for some private emails of James Rosen, the chief Washington correspondent for Fox News. Investigators also tracked Rosen’s comings and goings from the State Department.