text:  Politics must never be a literal battlefield, a God forbid, a killing field. I believe politics ought to be an arena for peaceful debate. The presidential campaign is about to be back in full gear. Tamara Keith, NPR News. Republican House Speaker Mike Johnson also called for a drop in heated political rhetoric in the country. Speaking on NBC's Today show, he said the shooting was a horrific act of political violence and the country cannot go on like this.