(CNN) A Middle East specialist with ties to Donald Trump's team attended secret meetings during the presidential transition between the United Arab Emirates and Trump associates, and is now cooperating with special counsel Robert Mueller, two people familiar with the matter say.
George Nader, a low-profile diplomatic go-between who has forged close ties to the Emirates, was stopped and questioned by the FBI at Dulles International Airport in January as he returned from an overseas trip, these sources say. Since then, he has been talking to Mueller's investigators and providing information to the grand jury.
Nader attended a December 2016 meeting in New York between Emirati officials and members of Trump's inner circle, and another in January 2017 in the Seychelles islands between the Emiratis and Erik Prince, a Trump associate. Nader was also in the Seychelles when Prince met with a Russian banker, the sources said.