David Gergen actually said...

"The candidate must set the tone for his responsibility. That is his responsibility."

"I don't see how a man who says he is a unifier, and that's where he wants to in the country who are call for peace's, rallies is backing down."

"He has to make a statement. It is critically important that they are peaceful."

"If you're going to be a unifier, that's part of what your pledge is. You have to rise to the occasion and this is the most important challenge to Donald Trump as a leader that he's facing the campaign..."