Both parties are grappling to define the nation's vital interests and responsibilities as the one remaining superpower.

Casey is premised on the states having an important constitutional role in defining their interests in the abortion debate.

It does fall to the President of the United States to define the nation's vital interests and then ask to defend them.

Such a definition would also embolden other countries to define their interests in the same way.

The question is: How does this country define its national interests?

It defined their common interests while pointing out that they disagreed on India's possession of nuclear weapons.

This sizable show defines his interests throughout the 90's.

"We now have to define our national interests in a new way and understand how our army helps to defend those interests."

I believe that the European Union should define its interests in the region.

The Western dominance, however, cannot last for long, and the East German electorate is certain to eventually define its own interests.