No policy has proved more successful in making friends for the United States, during the cold war and since, than educating students from abroad at our colleges and universities.

No president is well-served by groupthink or by everybody singing from the same sheet of music they think he's on.

If possible, to be in a position to announce who is going to step in as the interim immediately. And if possible, to announce who you're going to nominate to replace that person. For that to be somebody of impeccable integrity and reputation disarms a lot of the worst criticism that it's some kind of a power play. It's a professional approach to replacing a senior official, which is always going to get a lot of attention.

We should never lose sight of the ethos that has made the Marine Corps - where 'every Marine is a rifleman' - one of America's cherished institutions and one of the world's most feared and respected fighting forces

Defense is not like other discretionary spending.

I think in the policies that have been followed since the president Donald Trump came into office, there really hasn't been any slack cut for the Russians. And I think one of the things that has surprised people has been that the relationship between the United States and Russia has in fact deteriorated since the election.

I will always be an advocate in terms of wars of necessity. I am just much more cautious on wars of choice.