Bicameral passage requires bills to pass both House and Senate in identical form before reaching the president. This process creates additional opportunities for legislation to be modified, delayed, or stopped.
After one chamber passes a bill, it goes to the other chamber, which can approve it as written, amend it, or reject it. If the second chamber makes changes, the bill must return to the first chamber for approval of those changes. This back-and-forth can continue multiple times.
When chambers cannot agree on identical language, they appoint a conference committee. Members from both chambers negotiate compromise language. The conference committee report must be approved by both chambers without amendment. If either chamber rejects the conference report, the bill dies.
Bicameral passage reflects the Framers' desire for careful consideration of legislation. The process prevents hasty lawmaking and ensures bills have broad support across different legislative bodies representing different constituencies and interests.
However, bicameral passage can also lead to gridlock and legislative inefficiency. When chambers are controlled by different parties, bicameral requirements can make it difficult to pass any legislation, contributing to governmental dysfunction during periods of partisan polarization.
The bicameral system represents a fundamental balance in constitutional design between deliberation and action, between preventing bad laws and enabling good ones.