LONDON — U.S. elections are rarely won on foreign policy — presidents enter the Oval Office focused on changing America, not the world.

But many presidents end up being defined by their foreign policy decisions.

Donald Trump’s first priority will be to deal with the challenges to American dominance posed by China and Russia. And, possibly, avoid war with either of them.

The U.S. remains the world’s most important economic and military power, but a resurgent China and Russia are determined to remake the rules that have guided the globe since 1945.

These challenges come as a post-World War II world order shaped largely by the United States begins to crack.

Russia is testing NATO, the U.S.-led military alliance. China is demanding influence to match its economic might.

As heard on The Hagmann Report