From NRDC:

NRDC also organized a letter of support for the legislation, which was signed by the Association of State Floodplain Managers, the Consumer Mortgage Coalition, the National Association of Realtors, R Street Institute, Enterprise Community Partners, the Pew Charitable Trusts, American Rivers, the Nature Conservancy, and the Union of Concerned Scientists. In July 2018, GAO committed to doing the study.