I think my best advice would be to separate Donald Trump, the president of the United States from whatever investigation is being conducted by the FBI. I mean, there is something to be said, frankly, about the need for the appointment of an independent prosecutor because the American people are entitled to have a full review of what happened as a result of what the Russians did during our election.

The fundamental premise is that neither the United States or the international community is going to allow Iran to develop a nuclear weapon.

The area of climate change has a dramatic impact on national security.

Rising sea levels, severe draughts, the melting of the polar caps, the more frequent and devastating natural disasters all raise demand for humanitarian assistance and disaster relief.

The reason we've always had a civilian in that job [Secretary of Defence] is because we really believe that it is policymakers who ought to control the military and not have the military control the military.

The consequence could be that we would have an escalation that would take place that would not only involve many lives, but I think it could consume the Middle East in a confrontation and a conflict that we would regret.

In this century, the 21st century, the U.S. recognizes our prosperity and our security depends even more on the Asia-Pacific region.