Nader attended a December 2016 meeting in NY 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.
To date, the intelligence panel has not had luck scheduling interviews with witnesses who are already cooperating with the Mueller investigation.
The meeting on a small island off the eastern coast of Africa was between Erik Prince, the founder of the private military contractor Blackwater USA, and an official with close ties to Russian President Vladimir Putin, the Washington Post reports.
The meeting with Kirill Dmitriev, the head of a Russian government-controlled wealth fund, was an unimportant encounter that happened while he was meeting with officials from the United Arab Emirates (UAE), Prince said to legislators.
Democrats on the House intelligence committee are sounding alarms about testimony regarding who attended a January 2017 meeting in the Seychelles that's come under intense scrutiny in the Trump-Russia probes.
The Post said Nader has been cooperating with Mueller and has met numerous times with investigators since he was stopped and questioned by the Federal Bureau of Investigation after he arrived at Washington's Dulles International Airport in January.
Mueller's investigators continue to ask witnesses - including former national security adviser Mike Flynn - about how administration officials connected with foreign officials during the campaign, transition and the administration. Since then, he has been talking to Mueller's investigators and providing information to the grand jury.
Prince said he never told Bannon about meeting Dmitriev.
Fox News judicial analyst Andrew Napolitano on Thursday defended the credibility of special counsel Robert Mueller's Russian Federation investigation, noting it's the former FBI director's job to "go down any rabbit hole he finds". Trump says there was no collusion between Moscow and his campaign and calls the investigation a witch hunt. In fact, Prince-founder of the security firm Blackwater and brother of Education Secretary Betsy DeVos-testified to a House panel about it a year ago.
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