Iowa's Republican U.S. Sen. Jon Ernst will face Democratic challenger Theresa Greenfield at 7 p.m. Monday in a debate televised by Iowa PBS. Watch the debate in the video above starting at 7 p.m. Monday. Ernst, of Red Oak, and Greenfield, of Des Moines, will take questions from reporters and discuss their platforms, concerns and future plans. David Yepsen, host of Iowa Press, will moderate the debate and be joined by Kay Henderson, news director for Radio Iowa, and Caroline Cummings, political reporter for Sinclair Broadcast Group. Because of current social distancing guidelines, there will be no studio audience.