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.

Defining Putin as America's main enemy is threat inflation at its worst.

The old Cold War rivals could team up against emerging powers.

His reaction to the truck attack in Berlin, and his disinterest in daily intelligence briefings, show a reckless indifference to Americans' safety.

Donald Trump's nomination of David Friedman as ambassador to Israel may finally clarify the U.S. position on Israel-Palestine.

His lies are a problem, but his belligerence is worse: It could start a war.

Exxon Mobil CEO Rex Tillerson could serve as a check on hawkishness.

Here's how Donald Trump can help—without a full-scale intervention.

His Taiwan call and other moves signal a shift from multilateral alliances to bilateral dealmaking. And it could destabilize the world.