They should condemn anti Muslim sentiment but what Trump is talking about is not anti Muslim sentiment. He was proposing a temporary ban on letting all Muslims into America. That's not racist. The legality of it or whether it's even feasible are arguments to be made but he's not against Muslims. His idea is very simple; if you don't let the Muslims into America then we will have less Muslim terrorists attacking us. And I think that makes sense but it's actually still very flawed.