A key witness in former special counsel Robert S. Mueller III’s investigation of Russian election interference has been charged with transporting child pornography last year, according to court documents.

George Nader, who has a previous conviction on such charges, was charged in federal court in Virginia and is expected to make an initial court appearance in New York.

Nader played an unusual role as a kind of liaison between Trump supporters, Middle East leaders and Russians interested in making contact with the incoming administration in early 2017.

Officials said Nader, 60, was charged by criminal complaint over material he was traveling with when he arrived at Washington Dulles International Airport on Jan. 17, 2018, from Dubai. At the time, he was carrying a cellphone containing visual depictions of minors engaged in sexually explicit conduct, officials said. The charges were unsealed after his arrest Monday morning at John F. Kennedy International Airport in New York.

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