US Constitution: Article 1, Section 9, Clause 8.
"No title of nobility shall be granted by the United States: and no person holding any office of profit or trust under them, shall, without the consent of the Congress, accept of any present, emolument, office, or title, of any kind whatever, from any king, prince, or foreign state."
The US President is prohibited from accepting gifts or money from foreign governments. But Trump's new hotel, just a few blocks from the White House, just held an event last week pitching foreign diplomatic delegations on moving their business to Trump's hotel.
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