House Republicans are gearing up for their first congressional hearing on the investigation by Democratic state attorneys general into Exxon Mobil and climate change.

Rep. Lamar Smith, chairman of the House Science, Space and Technology Committee, said he would hold a Sept. 14 hearing. The Texas Republican has been busy subpoenaing the attorneys general of New York and Massachusetts over their Exxon investigations. The hearing is meant to demonstrate congressional authority to investigate the attorneys general.