TOPEKA ? Tea party challenger Milton Wolf is planning a 45-stop bus tour of Kansas to boost his campaign for the U.S. Senate ahead of the state’s Republican primary.

Wolf’s campaign says he will launch the bus tour with a Saturday morning send-off from his campaign headquarters in Overland Park. It plans an afternoon event at Chisholm Creek Park in Wichita, followed by an evening rally there.

Wolf doesn’t plan to take a break from the tour until it ends Aug. 2 at his campaign headquarters.

Wolf is a 43-year-old Leawood radiologist trying to unseat three-term Republican U.S. Sen. Pat Roberts in the Aug. 5 primary. Two lesser-known candidates are also on the GOP ballot.

Shawnee County District Attorney Chad Taylor and Lawrence attorney Patrick Wiesner are seeking the Democratic nomination.