For more than a decade, the U.S. Supreme Court has turned a skeptical eye toward Congress. Distrustful of Congress's capacity to respect constitutional boundaries, the Court has recently overturned federal legislation at a historically unprecedented rate. This intensified judicial scrutiny highlights the need for increased attention to how Congress approaches constitutional issues. In this important collection, leading scholars in law and political science examine the role of Congress in constitutional interpretation, demonstrating how to better integrate the legislative branch into understandings of constitutional practice.