NEW : Former President Nicolas Sarkozy resigned over funding for his 2007 campaign . L'Oreal magazine heiress Liliane Bettencourt is suspected of illegally helping him . Bettencourt , 90 , is France 's richest man . Judge Jean-Michel Gentil questioned the former French leader on Thursday for 12 hours concerning evidence given by 90-year-old Bettencourt 's former accountant , Claire Thibout , CNN affiliate BFM-TV reports . France 's former labor minister Eric Berry and others have also attracted scrutiny .
NEW : Former President Nicolas Sarkozy resigned over funding for his 2007 campaign . L'Oreal magazine heiress Liliane Bettencourt is suspected of illegally helping him . Bettencourt , 90 , is France 's richest man . France 's former labor minister Eric Berry and others have also attracted scrutiny .