Determining if Regulatory Actions are in the Interest of the Nation or the Swamp Act of 2017 or the DRAIN the Swamp Act of 2017 This bill requires each agency to submit to the Government Accountability Office (GAO), for each major rule that the agency proposes or finalizes, an assessment and quantification of any regulatory conflict of interest (i.e., providing a substantial pecuniary benefit to the President and certain advisors) pertaining to that major rule. Before a major rule may take effect, the agency must submit to the GAO and publish in the Federal Register the assessment and quantification. This bill does not apply to rules if an agency finds that notice and public procedure for the rule are impracticable, unnecessary, or contrary to the public interest.