Rational basis review begins with establishing the factual predicate upon which the exercise of congressional power is based. Thar factual basis might come from a variety of sources. It might come from factual determinations made by Congress, passed in the legislation itself, or found in the congressional reports that are issued to accompany the legislation. It might come from the record of testimony compiled in committee hearings. It might come from facts posited by proponents in their briefs in support of the legislation. For example, the Court referenced extensive testimony presented in hearings in support of the conclusion that discrimination in public accommodations reduces interstate commerce. The Court wrote: