TOPEKA, Kan. (AP) — Republican U.S. Senator Pat Roberts's re-election campaign in Kansas is being overhauled as his race becomes an unexpected battleground in the fight for control of the Senate. Roberts confirmed Friday that longtime aide Leroy Towns stepped down as his executive campaign manager but said he will remain a consultant to the campaign. Towns was Roberts's chief of staff for more than 20 years and remained a political adviser after leaving Roberts's congressional office in 2002. Roberts also said the National Republican Senatorial Committee is sending in a seasoned consultant. The consultant is Chris LaCivita. Kansas was seen as a safe GOP state, but the three-term incumbent looked vulnerable after a tough primary fight. Before an event in Wichita, Roberts said his campaign is preparing to become more aggressive.