"Whenever I have had my doubts, I remembered the construction worker in Philadelphia because he came up to me and he said "Sir I got only one criticism of that Cambodia thing; if you'd gone in earlier you might've captured the gun that killed my boy three months ago." So you're asking me do I regret going into Cambodia?... No, I don't. You know what, I wish I'd gone in sooner. And harder!"
January 1, 1970
https://en.wikiquote.org/wiki/Frost%2FNixon_(film)