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.
Gergen emphasizes the importance of unity for Trump as a leader amidst the challenges he faces.
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It's very, very big. Not legally, but politically, it's a very, very big deal.
I think it's going to take something usually unexpected or a dramatic change in his health or a prison sentence to stop him.
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