 Radio Iowa, I'm Dar Danielson. One of the Republican leaders in the state Senate who faced a strong challenge in June's GOP primary is resigning. O.K. Hederson reports. Waylon Brown of Osage is a farmer and construction company owner who's been a state senator since 2017. He's been the majority whip for Senate Republicans, too. In a written statement, Brown said his departure from the Iowa Senate would be effective on Wednesday, but offered no other explanation for his resignation.