Jonathan Karl quotes:

Donald Trump is speaking on behalf of the White House, of the executive branch of the United States. Credibility matters.

At every step Donald Trump has been - his legitimacy has been questioned.

Clearly, I regret the email was quoted incorrectly and I regret that it's become a distraction from the story, which still entirely stands. I should have been clearer about the attribution. We updated our story immediately.

Telling the truth is absolutely important.

I think that we need to be careful, as reporters and as journalists, not to take the bait and not to get into an endless discussion about issues that are trivial.

I don't know that the conservatives truly realize this yet, but they are talking about repealing the mandate that says you must have health insurance, and they're talking about repleaing the taxes that help to finance it.