Trump’s actual decisions matter far more than his confrontational behavior. But his behavior can still affect the options that are available to him. If his public approval sinks too low, fewer members of Congress will work with him, and more will work against him.
The recent behavior of UK Prime Minister Theresa May's government suggests that it is putting US President Donald Trump's political interests before those of the EU and the rest of the world. But now more than ever, Britain and the EU must defend and promote liberal democratic norms.