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KEY POINTS George Nader, who was a key witness in special counsel Robert Mueller's probe, is charged in a new federal indictment with transporting a 14-year-old boy for sex, child pornography and carrying obscene materials.

Nader has been an advisor to Crown Prince Mohammed bin Zayed Al-Nahyan of the United Arab Emirates.

Mueller's report says Nader helped arrange a January 2017 meeting between Erik Prince and the head of Russia's sovereign wealth fund, who reported directly to Vladimir Putin, as part of a purported Russian effort to build a link with President Donald Trump's new administration.

This 1998 frame from video provided by C-SPAN shows George Nader, president and editor of Middle East Insight. As an adviser to Abu Dhabi's crown prince, Sheikh Mohammed bin Zayed Al Nahyan, Nader worked throughout 2017 with Elliott Broidy, a fundraiser for President Donald Trump, in a secretive lobbying effort to alter U.S. policy in the Middle East. C-SPAN via AP

The third count accuses Nader of knowingly transporting a 14-year-old boy from Europe to Washington Dulles Airport in February 2000 and then allegedly engaging in sexual acts with that child after taking him to Nader's home in Washington. The boy was from the Czech Republic, a prosecutor reportedly said at Nader's arraignment on Friday. The Washington Post reported Friday that in 2003 "Nader was convicted in the Czech Republic of what his attorney Christopher Clark described in court as 'contributing to the moral corruption of society' after 'having a relationship with two young men two years under the age of consent.' " The Associated Press said he was sentenced to one year in prison in that earlier case. Nader pleaded not guilty to the charges during his arraignement in federal court in Alexandria, Virginia, where a judge refused to grant him bail, noting, "the nature of the charges and [his] extensive overseas connections," The Post reported. A dual citizen of Lebanon and the United States, Nader is scheduled to go on trial on Sept. 30 He was convicted of a child pornography charge in Virginia in 1991 and sentenced to six months in prison. Nader faced a similar charge in Washington, D.C., in 1985, but that case was dismissed as a result of an invalid search warrant. Defense lawyers for Nader did not immediately return requests for comment from CNBC. Nader helped arrange a January 2017 meeting in the Seychelles between Erik Prince and Kirill Dmitriev, the head of Russia's sovereign wealth fund, who reported directly to Russian President Vladimir Putin, according to Mueller's report on his investigation into Russian interference in the 2016 presidential election. Prince is the brother of Education Secretary Betsy DeVos, the founder of private security firm Blackwater, and he is also a supporter of President Donald Trump. "Nader traveled to New York in early January 2017 and had lunchtime and dinner meetings with Erik Prince on January 3, 2017," Mueller's report says.