Former Sen. Bob Smith (R-N.H.) on Sunday told New Hampshire news outlet WMUR that he will challenge Sen. Jeanne Shaheen Jeanne ShaheenSenators approve shift in funding to ease airport wait times Carter pledges probe of sex assault testimony Pentagon looks to reduce billion energy bill MORE (D-N.H.) in the upcoming election.
Smith was elected to the Senate in 1990 and represented New Hampshire in the Senate until he lost the 2002 Republican primary to Sen. John Sununu.
Smith told WMUR that he will be moving to New Hampshire full time and launch his campaign in January, as well as filing paperwork to form his committee campaign in the coming days.
The Republican field for 2016 includes former state Sen. Jim Rubens and activist Karen Testerman, and former Sen. Scott Brown (R-Mass.) was rumored to be considering entering the race.
--This report was updated at 5:15 p.m.