When it came to the Vietnam War, Mr. McNamara was an early advocate of escalation but came to realize the flaws in the American approach earlier than many of his colleagues. Yet in public, he continued to defend the war.

The key to U.N. reform is giving Americans a clearer picture of what the U.N. is and what it isn't, what it can be and what it can't be.

I think the point that we all agree upon is that we have to engage with Russia.

I get to be married to the liveliest mind I've ever encountered.... I hit the jackpot.

Countries that intervene militarily rarely do so out of pure altruism.

President Reagan, of course, did more than any other person to entrench the Republican reputation for toughness on national security.

In general, my rule is find out where your heart is, then speak from the heart. People know the difference between that and something scripted.