Who is responsible for signing bills into law in the United States?

The responsibility for signing bills into law in the United States lies with the President. Once Congress has passed a bill, it is presented to the President, who has the authority to either sign it into law or veto it. This process is a fundamental part of the legislative procedure outlined in the U.S. Constitution. The President's ability to sign or veto legislation serves as a check on the legislative branch, reinforcing the system of checks and balances that is essential to American government.

In contrast, the Vice President's role is primarily to support the President and to preside over the Senate, but they do not have the power to sign bills into law. Congress, while it is responsible for drafting and approving legislation, does not have the authority to enact those bills without the President's signature. The Supreme Court, on the other hand, interprets the laws and assesses their constitutionality, but it does not have a role in the legislative process of signing bills into law.