French tycoon and politician Serge Dassault is being investigated in connection with an alleged vote-rigging scandal.
Dassault is head of Dassault Holding, which controls stakes in major defence companies as well as right-leaning Le Figaro newspaper.
He is ranked by Forbes magazine as France’s 4th-richest man with an estimated fortune of 13 billion euros.
Dassault’s immunity to prosecution was recently lifted by the French Senate.
The inquiry was opened after the discovery of 2 million euros in suspicious money transfers made during the time the 88-year-old served as mayor in Paris suburb Corbeil.
Dassault “strongly denies the opening of this investigation which is not based on any serious evidence,” his solicitor, Pierre Haik, said in a statement.