Washington – The CEO of Delphi Automotive Plc is set to be questioned by a U.S. Senate panel in connection with a probe into General Motors Co's handling of an ignition switch issue with some of its automobiles. As reported by Reuters, a Senate Commerce subcommittee hearing set for July 17 will be the first time an executive of the company that makes the ignition switches linked to the problem will appear before committees involved in the GM investigation.