A top House Republican on Thursday accused the Securities and Exchange Commission of going after Exxon Mobil for not having a politically acceptable view of climate change.

Rep. Lamar Smith, the chairman of the House Science, Space and Technology Committee, made the accusation in a letter to the SEC requesting documents and communications related to the agency’s investigation of Exxon Mobil. The agency is investigating the oil giant for how it values its oil reserves in the wake of plummeting prices and how it works climate change into its estimations of the company’s future value.