The U.S. Virgin Islands attorney general withdrew a subpoena of the Competitive Enterprise Institute think tank that he was investigating as a part of a deeper look into what Exxon Mobil knew about climate change.

U.S. Virgin Islands Attorney General Claude Walker filed a notice of termination in the D.C. Superior Court for the subpoena for the Competitive Enterprise Institute on Friday, according to court documents. Walker filed the subpoena to try to get information about Exxon Mobil’s donations to the think tank between 1997 and 2007.