Twitter defied a U.S. government request for records that could identify users behind an account opposed to President Donald Trump, and is challenging that order in court.
The company filed its lawsuit Thursday in a San Francisco federal court against the federal Department of Homeland Security and its Customs and Border Protection office, charging that their efforts to "unmask" the people behind the account violate the First Amendment.
Twitter said its users have a constitutional right to disseminate such "anonymous and pseudonymous political speech." It declined to comment beyond the lawsuit. DHS likewise declined to comment.