A group targeted by Democratic attorneys general in a climate change investigation hit back at subpoenas they call “unlawful and un-American” in a new video posted Tuesday.

The Competitive Enterprise Institute fought off a subpoena from U.S. Virgin Islands Attorney General Claude Walker earlier this year. Walker’s subpoena was sent to the group to try and get information about ExxonMobil’s donations to the climate change-doubting think tank from 1997 to 2007.