A billionaire Macau developer arrested for lying to U.S. customs officials about why he brought $4.5 million in cash into the United States was subpoenaed in 2014 as part of a separate foreign bribery investigation, a source familiar with the matter said on Friday. Ng Lap Seng, who was previously tied to a Clinton-era campaign finance probe, is being held without bail on charges filed in Manhattan federal court that he lied to U.S. customs officials about the purpose of the cash he brought into the country over a two-year period.