Special Counsel Robert Mueller has obtained evidence that calls into question Congressional testimony given by Trump supporter and Blackwater founder Erik Prince last year, when he described a meeting in Seychelles with a Russian financier close to Vladimir Putin as a casual chance encounter “over a beer,” sources told ABC News.

Well-connected Lebanese-American businessman George Nader, a key witness given limited immunity by Mueller, has been interviewed seven times by prosecutors on a wide range of subjects. He told investigators that he set up a meeting in the Seychelles between Prince and Russian sovereign wealth fund CEO Kirill Dmitriev, mere days before Trump was inaugurated, sources familiar with the investigation said this week.

Nader has submitted to three interviews with special counsel investigators and four appearances before a federal grand jury in Washington since agents stopped him at Dulles International Airport in January, served him with a grand jury subpoena and seized his electronic devices, including his cell phone. Documents obtained by Mueller suggest that before and after Prince met Nader in New York a week before the trip to the Seychelles, Nader shared information with Prince about Dmitriev, sources familiar with the investigation told ABC News, which appears to be inconsistent with Prince’s sworn testimony before a U.S. House of Representatives investigative panel.

"I didn't fly there to meet any Russian guy," Prince told the House Permanent Select Committee on Intelligence in November. He testified that he travelled to the Seychelles for a meeting with United Arab Emirates officials about possible business opportunities, and they introduced him – unexpectedly – to Dmitriev.

The special counsel's office declined to comment on this story when reached by ABC News.

As of late March, Mueller’s team has not asked Prince – whose sister Betsy DeVos serves as Trump’s Secretary of Education – to appear before the grand jury being used to investigate whether Trump campaign officials or transition aides colluded with Russian government operatives, according to one of Prince’s friends.

PHOTO: Kirill Dmitriev, chief executive officer of Russian Direct Investment Fund (RDIF), attends the World Economic Forum (WEF) in Davos, Switzerland, Jan. 19, 2017. (Jason Alden/Bloomberg via Getty Images, FILE) More

Prince told the House Intelligence Committee that his meeting with Dmitriev was a chance encounter “down in the bar” at the suggestion of "one of the brothers" of the United Arab Emirates' leader Crown Prince Mohammed Bin Zayed al-Nayhan.

"At the end, one of the entourage says, 'Hey, by the way, there’s this Russian guy that we’ve dealt with in the past. He’s here also to see someone from the Emirati delegation. And you should meet him. He'd be an interesting guy for you to know, since you’re doing a lot in the oil and gas and mineral space,’” Prince told lawmakers under oath in his sworn testimony. “So, as I recall, I met him, this same guy I talked about, Kirill Dmitriev. Met him down in the bar after dinner, and we talked for 30 minutes over a beer, and that was it.”

Sources say Nader -- who worked at the time for the Emirati leader, known as "MBZ” – tells a different story. According to multiple sources, the U.A.E., an important U.S. ally increasingly eager to be seen as a global powerbroker, wanted to bring a Russian close to the Kremlin together with someone Nader believed was a trusted confidant of members of the incoming administration.

Sources tell ABC News Nader met with Prince at New York's Pierre Hotel a week before the Jan. 11, 2017 meeting in the Seychelles, and later sent Prince biographical information about Dmitriev, which, according to those sources, noted that Dmitriev had been appointed by Putin to oversee the state-run sovereign wealth fund.

Nader says he then facilitated and personally attended the meetings, including one between Prince and Dmitriev, at a resort owned by MBZ off the coast of East Africa, the sources told ABC News. One of the primary goals of the meeting, Nader told investigators, was to discuss foreign policy and to establish a line of communication between the Russian government and the incoming Trump administration, sources told ABC News.

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