AMES, Iowa (AP) — Plans for a debate between Republican U.S. Rep. Steve King and Democratic challenger Christie Vilsack have been called off due to a disagreement over the debate format. Both campaigns had agreed to the date and location, but the King campaign wanted to use a format in which the candidates would ask each other questions. The sponsors wanted an opportunity for questions from constituents that would be posed by a panel. The debate was slated for Sept. 22 at Iowa State University. The Ames Tribune was among the sponsors. Tribune Editor Alexandra Hayne says it’s unfortunate because the goal was to give voters a look at the candidates beyond their standard speeches and press releases. A series of debates is still expected between the candidates.