U.S. Rep. Todd Platts, R-York County, said the U.S. Justice Department is already looking into potential sources of the confidential documents that showed up on WikiLeaks, revealing some jarring and potentially damaging diplomatic secrets.If it’s someone in the United States, that would make it easier, Platts said. If not, the Justice Department will just have to proceed through whatever channels it uses to get at foreign nationals who have committed crimes against Americans.