A chair person chosen for the committees in congress is based on the member who is longest serving in the committee i.e. based on seniority of the member.
Committee refers to the group of people working together as its member and each one of them having some specific function.
The committee chair are selected on the basis of the seniority of the person in the party who has been serving for long time to the party. However in some of the exceptional cases it may not dependent upon the age factor.
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