“To a remarkable degree, the United States relies on liaison relationships with other powers with whom it shares information. If Trump has indeed compromised a source of information, it is not merely a betrayal of an ally’s trust: It is an act that will jeopardize a whole range of relationships. After all, the Director of Central Intelligence cannot very well say, “Don’t worry, we won’t share that with the president.” So now everybody—even our closest allies like the United Kingdom—would be well-advised to be careful with what they share with us.” More…