A businessman who was a witness named in the Mueller report pleaded guilty on Monday to child pornography possession and sex trafficking charges, according to court documents.

The businessman, George Nader, who has also acted as an informal adviser to the United Arab Emirates’ crown prince, pleaded guilty to two counts of possession of child pornography and one count of sex trafficking a minor in the United States District Court for the Eastern District of Virginia.

On the possession of child pornography charge, Mr. Nader faces a mandatory minimum term of 10 years in prison, a fine of $250,000 and at least five years of supervised release, court documents said. He faces a maximum of 15 years in prison and a $250,000 fine on the sex trafficking charge. Mr. Nader must register as a sex offender, the documents said.

His sentencing hearing is set for April 10, according to Jonathan Jeffress, one of Mr. Nader’s four lawyers. He declined to comment further.