The founding fathers did not want any foreign payments to the president. Period. This principle is enshrined in Article 1, Section 9 of the Constitution, which bars office holders from accepting “any present, emolument, office, or title, of any kind whatever, from any king, prince, or foreign state.”
This provision was specifically created to prevent the President, most of all, from being corrupted by foreign influences.
Virginia Governor Edmund Jennings Randolph addressed the issue directly during a Constitutional debate in June 1788, noting that a violation of the provision by the President would be GROUNDS FOR IMPEACHMENT.
Trump’s businesses, foreign and domestic, are receiving a stream of such payments and emoluments.