The legislative practice that assigns the chair of a committee or subcommittee to the member of the majority part with the longest continuous service on the committee is known as the

Question

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The practice described in the question is commonly known as the seniority rule, which gives preference to more experienced members of a committee or subcommittee to hold the chair position. This practice has been in place in the U.S. Congress for many years, allowing more experienced members to gain leadership positions and have greater influence in the legislative process.

The Legislative Practice That Assigns the Chair of a Committee