Spelling potentially new trouble for U.S. Rep. Jesse Jackson Jr., federal investigators have launched a probe into the South Shore congressman’s finances — a completely new area of inquiry, sources told the Chicago Sun-Times.

The investigation is not related to the sale of the U.S. Senate seat that figured in former Gov. Rod Blagojevich’s conviction, but is focusing on “suspicious activity” involving the congressman’s finances related to his House seat and at the possibility of inappropriate expenditures, sources said.

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