From 1910 to 1975 committee and subcommittee chairmanship was determined purely by seniority; members of Congress sometimes had to wait 30 years to get one, but their chairship was independent of party leadership. The rules were changed in 1975 to permit party caucuses to elect chairs, shifting power upward to the party leaders. In 1995, Republicans under Newt Gingrich set a limit of three two-year terms for committee chairs.