A key witness in the Mueller investigation has been charged with transporting child pornography in 2018 according to court documents.

According to the Washington Post, Middle East advisor and businessman, George Nader, was caught with pictures of underage males performing sexual acts on one another in January 2018. He was arrested at JFK International airport on Monday morning:

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.

The Washington Post reported that Nader had helped arrange a meeting with Trump supporter Erik Prince and a Russian official Kirill Dmitriev  the head of a Russian government-controlled wealth fund:

He helped arrange a meeting in the Seychelles in January 2017 between Erik Prince, a Trump supporter who founded the private security firm Blackwater, and a Russian official close to Russian President Vladi­mir Putin. The purpose of the meeting was of particular interest to Mueller’s investigators, and some questions about it remain unanswered, even after Mueller issued a 448-page report on his findings.

Nader had been working as an advisor to the United Arab Emirates for some time and swore that the meeting was complete chance due to his location.

This isn’t the first time Nader had been caught with child pornography. Nader was also convicted 28 years ago for carrying around underage pornography but received a reduced sentence due to government officials considering him a valuable part of negotiations in a hostage situation in Lebanon.