TOPEKA, Kan. (AP) — A retired assistant U.S. attorney who once led the prosecution of the accused mastermind of the deadly 2000 bombing of the USS Cole is running for Kansas attorney general next year.

Tony Mattivi on Monday launched his campaign for the Republican nomination by announcing that Sedgwick County District Attorney Marc Bennett will serve as its campaign treasurer. His campaign said it plans a formal kickoff in the near future.

The GOP race already has two other major candidates. They are polarizing conservative Kris Kobach, a former Kansas secretary of state known nationally for...