Mr. Mueller appears to be examining the influence of foreign money on Mr. Trump’s political activities and has asked witnesses about the possibility that the adviser, George Nader, funneled money from the Emirates to the president’s political efforts. It is illegal for foreign entities to contribute to campaigns or for Americans to knowingly accept foreign money for political races.
Mr. Nader, a Lebanese-American businessman who advises Crown Prince Mohammed bin Zayed Al-Nahyan, the effective ruler of the Emirates, also attended a January 2017 meeting in the Seychelles that Mr. Mueller’s investigators have examined. The meeting, convened by the crown prince, brought together a Russian investor close to President Vladimir V. Putin of Russia with Erik Prince, the founder of Blackwater and an informal adviser to Mr. Trump’s team during the presidential transition, according to three people familiar with the meeting.
Mr. Nader’s cooperation in the special counsel’s investigation could prompt new legal risks for the Trump administration, and Mr. Nader’s presence at the Seychelles meeting appears to connect him to the primary focus of Mr. Mueller’s investigation: examining Russian interference during the 2016 presidential campaign.