More than 300 newspapers and media outlets have launched a campaign to counter President Donald Trump’s attacks on the free press. The effort was led by The Boston Globe, which wrote in an editorial, “For more than two centuries, this foundational American principle has protected journalists at home and served as a model for free nations abroad. Today it is under serious threat. And it sends an alarming signal to despots from Ankara to Moscow, Beijing to Baghdad, that journalists can be treated as a domestic enemy.”