Answer :
When members of congress vote in party meetings to select committee chairpersons subject to leadership approval, the person selected is typically chosen to primarily on the basis of Length of service (seniority) in the committee and membership in the majority party.
The Senate cannot function effectively without its committees. In order to draft, consider, and recommend legislation to the entire membership of the Senate, committees acquire information through investigations and hearings on local, national, and international issues that fall within their jurisdiction. The Senate floor hears only a small portion of the bills considered by committees. They offer oversight of federal government operations and assess presidential nominations for executive and judicial positions. In most cases, the seniority system is used to select committee chairs. Under the seniority system, the majority party committee member with the longest term is automatically chosen.
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