A key witness in special counsel Robert Mueller’s Russia investigation who was arrested earlier this week on child pornography charges also had communications with the crown prince of the United Arab Emirates on his phone, according to prosecutors.

George Nader, 60, was an adviser to Mohammed bin Zayed and acted as a connection between President Trump’s circle and Russian and Middle East officials in 2016 and 2017.

Federal authorities found three phones on Nader when they executed a search warrant in January 2018, according to court filings. One of those phones allegedly contained child pornography, the affidavit said.

Prosecutors said in court Friday they also found communications with the ruler of the UAE, the Daily Beast reported.

Nader is being held in an Alexandria, Va., jail. He was arrested at New York’s John F. Kennedy International Airport after returning from Dubai.

Nader helped set up a January 2017 meeting in Seychelles between Trump associate and Blackwater founder Erik Prince and a Russian official with close ties to Russian President Vladimir Putin.

Nader was subpoenaed in January 2018 in Mueller’s investigation into Russian interference in the 2016 presidential election. He reportedly testified to the grand jury about his interactions with Trump supporters.

He previously pleaded guilty to a federal child pornography charge in 1991. In that case, he was sentenced to six months in prison for transporting sexually explicit materials in foreign commerce.