The National Press Club president expressed alarm on Tuesday about Donald Trump’s dangerous attitude toward the First Amendment. At a press conference earlier in the day, Trump had said “the press should be ashamed of themselves” for investigating his fundraising for veterans. Trump at one point called an ABC News reporter a “sleaze.” “You know my opinion of the media,” Trump said, “it’s very low.” Two days before, Trump had told a crowd on the National Mall that reporters are “liars” and “lowlifes.” Trump had previously called for making it easier for public figures to sue news organizations for libel,...