At a rally in Kansas on Monday, President Trump looked to boost Republican Sen. Roger Marshall in his reelection bid. Marshall faces a surprisingly close race with his Democratic challenger, Pastor Adam Hamilton. William Brangham discusses the Senate race with Jared Cerullo of PBS Kansas, the host of the weekly current affairs show, "Kansas Week."

President Donald Trump is heading to Kansas on Monday and Iowa later in the week, the latest in a series of stops where he's trying to energize his base in the final weeks before the midterm elections. The economic strain is becoming a growing political concern for Republicans in states they have long dominated.