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."

Police in Bend, Oregon, are still investigating the motive behind the deadly shooting at Silver Rail Elementary School. Four people were killed, including three young children and a teacher. Police identified the shooter as a 16-year-old who previously attended the school. They said he attacked a special education classroom before being killed at the scene. William Brangham reports.