The two major roles of members of Congress are representation and lawmaking.
The United State Congress is the legislature of the federal government. Elected by direct vote, the members of Congress represent the interests of their constituents by holding meetings and developing, drafting, and voting on legislation. All bills are required to be passed by Congress before presented to the President to signed into law. Hence, the two major roles performed by members of Congress are representation of their constituents and lawmaking to safeguard the constituents interest by passing a bill that becomes a law. Congress other responsibilities include holding hearings to inform the legislative process, funding government functions and programs, and oversight of the executive branch.
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