Republicans in Mississippi’s 2nd Congressional District will determine a nominee that will go head to head against a longtime Democratic incumbent in Tuesday’s runoff election.

Rep. Bennie Thompson (D-MS) has served 16 terms in the House, representing a majority black district since 1993. Vying to unseat Thompson are Republicans Ron Eller and Andrew Scott Smith, who received the most and second-most votes in the March 12 Republican primary but did not meet the threshold to secure a definitive win.