<Tr> <Td> </Td> <Td> This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations . Please help to improve this article by introducing more precise citations . (September 2016) (Learn how and when to remove this template message) </Td> </Tr> <P> This is a list of United States congresspersons by longevity of service . It includes Representatives and Senators who have served at least 36 years . It is divided up into several categories . </P> <P> In cases where there is a tie in time the following criteria will sort people higher: </P> <Ol> <Li> Achieved time uninterrupted (total tenure rank only) </Li> <Li> Achieved time first </Li> <Li> Senators over Representatives (House and Senate list only) </Li> <Li> Senate or House seniority (Dan Rostenkowski versus Neal Edward Smith) </Li> </Ol>

Who is the longest serving republican senator that is currently in office