Pompeo Questions the Value of International Groups Like UN and EU

Pompeo called Britain's decision to leave the European Union a 'political wake-up call' for the bloc

In a major speech on Tuesday, Secretary of State Mike Pompeo tried to explain one of the abiding conundrums of the Trump administration: How does a nationalist lead on the international stage?

The answer, he said, is to revamp or jettison some treaties and institutions while bolstering others.

Among the institutions that Mr. Pompeo criticized were the United Nations, the European Union, the Organization of American States and the African Union. But he embraced NATO, which President Trump has harshly criticized, as an “indispensable institution.”

The speech, delivered in a palatial hall in Brussels, was intended to explain Mr. Trump’s worldview to a