Supreme Court Justice Clarence Thomas attended at least two donor events for the Koch network, according to a ProPublica report published Friday.

Thomas in 2018 went to a private dinner for donors at the group’s annual summit in California and was brought in to speak with the hopes that the access would encourage donations, according to the report.

Charles and David Koch over the years built an influence network that poured millions into conservative and libertarian causes. David Koch died in 2019.

Thomas did not disclose the trip to the summit on his annual financial disclosure, though ProPublica did not identify who paid for the private jet flight.