An environmental group whose request for records related to the Keystone Pipeline was reportedly hampered while Hillary Clinton served as secretary of state is considering taking the case to court for the second time.

Ben Schreiber, climate and energy program director at Friends of the Earth, said his group has weighed the option of relitigation in the weeks since learning that Clinton’s chief of staff, Cheryl Mills, had interfered in the agency’s handling of Freedom of Information Act requests for Keystone documents.