The partner was Anar Mammadov, the son of a government minister suspected by US diplomats of laundering money for Iran's military and described as "notoriously corrupt."
Eighteen months later, and only weeks after daughter Ivanka Trump released a publicity video of the nearly finished project, references to the Baku project have disappeared from Trump's website. Trump's general counsel, Alan Garten, told The Associated Press that it was on hold for economic reasons.
Trump often talks of hiring the best people and surrounding himself with people he can trust.
The Trump camp's vetting skills are important as the presumptive Republican presidential nominee turns to selecting a running mate. They would become even more crucial if he won the White House.
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As president, Trump would have to name more than 3,600 political appointees to senior government jobs, including critical positions overseeing the national security and the economy.
But Trump had not researched the allegations against the Baku partner's father because the father was not a party to the deal, Garten said.