What is most troubling about Mr. Putin's aggression in Crimea is that it reflects a growing disregard for America's credibility in the world. That has emboldened other aggressive actors - from Chinese nationalists to Al Qaeda terrorists and Iranian theocrats.

In 1987, I had my first opportunity to provide 'advice and consent' on a Supreme Court nominee. At that time, I stated that the qualifications essential for evaluating a nominee for the bench included 'integrity, character, legal competence and ability, experience, and philosophy and judicial temperament.' On that test, Elena Kagan fails.

My record shows that I have put my country first, and I follow the philosophy and traditions of Abraham Lincoln and Theodore Roosevelt and Ronald Reagan.

I think it's important for the president of the United States to be aware of the intelligence information that we have.

I'm sorry, it's true. Having children really changes your view on these things. We're born, we live for a brief instant, and we die. It's been happening for a long time. Technology is not changing it much - if at all.

Civilization has given us enormous successes: going to the moon, technology. But then this is the civilisation that took us to debt, environmental crisis, every single crisis. We need a civilization where we say goodbye to these things.

I am personally a big believer that technology is the biggest driver of human development, and if you can use technology to benefit people, then that's the best business you can have.

I've sold all but one of my microphones, put away my mini-notebooks, stopped scouring the Internet for scraps of wisdom.