Summary: After weeks of public hearings, debate and charges against President Donald Trump at long last, has impeachment actually changed anyone's mind? This week on “The Argument,” the columnists talk polling, persuasion and public opinion on impeachment. Then, what do the results of last week’s British elections portend for Democrats in the U.S. — and what does Brexit mean for the future of the U.K.? For background reading on this episode, visit nytimes.com/theargument
