And I hope that we can learn the lessons of the past in looking at the current challenge that China poses to a ruling America.

Terrorism is really the only existential threat to America as we know it - as a free country that plays a leading role in the world.

And I hope that we can learn the lessons of the past in looking at the current challenge that China poses to a ruling America.

When a rapidly rising power rivals an established ruling power, trouble ensues. In 11 of 15 cases in which this has occurred in the past 500 years, the result was war. The great Greek historian Thucydides identified these structural stresses as the primary cause of the war between Athens and Sparta in ancient Greece. In his oft-quoted insight, "It was the rise of Athens and the fear that this inspired in Sparta that made war inevitable."

I think the election of Trump was an expression of what happens in ruling powers as they become alarmed.

I think we should be organized in something called an Alliance Against Nuclear Terrorism. In the same way that NATO was the great alliance of the Cold War and served a great purpose then, we need now, in the war on terrorism, a new alliance, the mission of which would be to minimize the risk of nuclear terrorist attacks, and the members would agree to sign on to the gold standard.

There are two great tragedies in life: one is to fail to achieve one's grandest ambitions, and the other one is to succeed.