[on Donald J. Trump's first week as president] Donald J. Trump is in the process of trashing the American presidency. He is just getting started. He thinks he is bigger than the office. The way the Trump presidency is beginning it is safe to say it will end in calamity. It is almost a certainty. Even Republicans know this!

[from testimony at the Watergate hearings] I began by telling the President that there was a cancer growing on the presidency and if the cancer was not removed, the president himself would be killed by it.

[on whether Watergate has permanently poisoned public faith in the presidency] People label things like signing statements as 'Nixonion'. Well, Nixon didn't issue that many signing statements and they weren't particularly provocative. The short answer is, I don't think it has damaged the presidency, but it has left a watermark and I think it will be a long time before it is breached.