In office since 1977, Hatch is the most senior Republican Senator, the second-most senior Senator overall, after Democrat Patrick Leahy of Vermont, who has served since 1975, and, having served for, the longest-serving Republican Senator in U.S. history.
Hatch is the most senior Republican Senator, after Democrat Patrick Leahy of Vermont and, having served for, the longest-serving Republican Senator in U.S. history. This was in office since 1977. Republican Senator is the second-most senior Senator overall. Vermont has served since 1975.