The power of Congress is limited by the Constitution, checks and balances, and public accountability. The Constitution sets boundaries for Congress, ensuring its actions comply with the law and protect rights. Checks and balances prevent overreach, while public opinion and elections hold Congress accountable. Constitutional constraints are most vital in upholding democracy and lawful governance.

The Constitution specifically outlines the powers of Congress in Article I, which includes the authority to make laws, levy taxes, declare war, regulate commerce, and oversee the federal budget. However, these powers are not limitless, as the Constitution also establishes checks and balances to prevent any one branch of government from becoming too powerful.

For example, the president has the power to veto legislation passed by Congress, but Congress has the ability to override a veto with a two-thirds majority vote. Additionally, the Supreme Court can declare laws passed by Congress unconstitutional, serving as a check on the legislative branch.

Public accountability further limits the power of Congress, as elected representatives are beholden to their constituents and must answer to the public for their actions. Regular elections provide an opportunity for the public to hold Congress accountable for their decisions and to make changes through the democratic process.

Overall, the power of Congress is limited by the Constitution, checks and balances, and public accountability to ensure that the legislative branch operates within the bounds of the law and serves the interests of the American people. These mechanisms are essential in maintaining a functioning democracy and upholding the principles of lawful governance.