A man who worked on President Trump's Presidential Advisory Commission on Election Integrity was arrested last week after police said they found child pornography on his cellphone, according to The Washington Post.

Ronald Williams II, who is from Maryland, worked as a researcher on the commission.

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Williams's arrest came after police conducted a search of his home after they were tipped off by the National Center for Missing and Exploited Children.

He is charged with 11 counts of possession and distribution of child pornography.

An administration official told the Post that Williams was fired this week, and had been on loan to the commission from the Office of Special Counsel, which is an independent government investigative and prosecutorial agency.

The commission was established to probe election fraud in the U.S.Vice President Pence chairs the commission, while Kansas Secretary of State Kris Kobach (R) serves as the co-chair. Trump and Kobach have both made unverified claims about widespread election fraud in the 2016 presidential election.