I have an idea for how POTUS might be able to stop this nonsense! He should just start every public speaking engagement, whether it's a rally, the debate or press briefing by saying "first let me start by saying I totally disavow all forms of white supremacy, hate groups and others of that nature"... then on with whatever he's talking about. Surely if he started every press briefing that way they'd get bored of this talking point and move on.