Reuters: “Twitter Inc on Thursday filed a federal lawsuit to block an order by the U.S. government demanding that it reveal who is behind an account opposed to President Donald Trump’s tough immigration policies. Citing freedom of speech as a basis for not turning over records, Twitter filed the lawsuit in federal court in San Francisco and said that the account, @ALT_uscis, claimed to be run by at least one federal immigration employee. The acronym CIS refers to U.S. Citizenship and Immigration Services, and the account describes itself as “immigration resistance.”