That's good news for Europe, if it seizes this moment to finally reform NATO.

What might countries accomplish now that they can't rely on America?

His agenda has stalled, but he's already done lasting damage to America.

Nixon was smart and calculating. Trump is just ignorant and incompetent.

The terrifying impact of the president's permanent uncertainty.

This week was pretty bad. But next week will be worse.

There is no "learning curve" for the president. He changes his tune for the same reasons a salesman does: to close the deal.

His administration can't get on the same page about Syria because there is no coherent foreign policy. Anything is possible, and that's horrifying.

The missile attack on Syria shows how the president has caved to the Pentagon—with deadly consequences for U.S. foreign policy.

Institutional safeguards have already checked a dangerous president—but risk eroding the institutions themselves.

America's most unpredictable president has come to power just as the liberal world order is giving way.

The president-elect joins a long minority tradition within the GOP of opposition to European alliances, and it could lead to global conflict.

And it could have disastrous consequences with Russia and China.