Seven-term Sen. Thad Cochran, Chairman of the Senate Appropriations Committee, announced he will resign his seat on April 1st. Cochran, 80, cited health problems in announcing the decision, according to The Associated Press. The Mississippi Republican is currently the 3rd most senior member of the Senate, behind only Democrat Patrick Leahy of Vermont and Republican Orrin Hatch of Utah. Hatch has previously announced he will retire at the end of 2018.
The Republican Gov. Phil Bryant will appoint a temporary replacement. A special election will be held on November 6th, coincident with the 2018 midterms. The winner of that race will serve the remainder of Cochran's term, which will next be contested in 2020.