One of the businessmen accused of conspiring with associates of Rudy Giuliani to make illegal campaign contributions argued Thursday in federal court that the government is trying to cover up the "warrantless and unlawful electronic surveillance" it conducted in its investigation, including possible "stingray" technology to track cellphones. Saying it now "appears to be the case" that the government obtained evidence through the use of the Foreign Intelligence Surveillance Act (FISA) and that it was "inconceivable" that no communications were intercepted, lawyers for Andrey Kukushkin sought an explanation as to the "genesis of such evidence and the extent to which...