Article I, Section 9, of the Constitution provides that “no Person holding any Office of Profit or Trust under [the United States] shall, without the Consent of Congress, accept any present, Emolument, Office, or Title, of any kind whatever, from any King, Prince, or foreign State.”
While Bill Clinton was president, his own Office of Legal Counsel once explained in an opinion letter, “those who hold offices under the United States must give the government their unclouded judgment and their uncompromised loyalty. . . . That judgment might be biased, and that loyalty divided, if they received financial benefits from a foreign government.” http://tws.io/1bQ38Z2
Dr. Larry Joseph Sabato, Professor of Politics at the University of Virginia, and director of its Center for Politics has commented: “Do you think this might suggest a conflict of interest? This is not a SUGGESTION of a conflict of interest—this IS a conflict of interest.” http://bit.ly/1F7OqqE