Tea party challenger Milton Wolf says he’s reserved $250,000 in television advertising time for his U.S. Senate race, but Republican incumbent Pat Roberts’ camp says it has spent twice that in recent weeks.

Wolf announced Friday that he’s reserved time on cable and broadcast stations throughout Kansas starting Wednesday and running through the Aug. 5 GOP primary.

Spokesman Ben Hartman said Wolf will start next week with an ad his campaign first aired on cable in April. It touts Wolf’s work as a Leawood radiologist and notes Roberts’ long tenure in Washington.

But Roberts executive campaign manager Leroy Towns said that since late May, the senator’s campaign has spent more than $500,000 on radio and TV ads.

Towns said the Roberts camp will continue to make substantial ad buys.