WASHINGTON — Twitter sued the Trump administration on Thursday, trying to stop an attempt at forcing the company to reveal personal information about the user of the @ALT_USCIS account.

“The rights of free speech afforded Twitter’s users and Twitter itself under the First Amendment of the U.S. Constitution include a right to disseminate such anonymous or pseudonymous political speech,” the lawsuit argues.

Filed in federal court in California, the lawsuit seeks a court order stopping the US Customs and Border Protection (CBP) from using its summons authority to demand Twitter turn over personal identifying information relating to the account, identified on Twitter as an “immigration resistance” account and “[n]ot the views of DHS or USCIS.”

The lawsuit alleges that the request violates the First Amendment, is not authorized under the relevant summons law, violates the Administrative Procedure Act.

“In these circumstances, Defendants may not compel Twitter to disclose information regarding the real identities of these users without first demonstrating that some criminal or civil offense has been committed, that unmasking the users’ identity is the least restrictive means for investigating that offense, that the demand for this information is not motivated by a desire to suppress free speech, and that the interests of pursuing that investigation outweigh the important First Amendment rights of Twitter and its users,” Twitter's lawyers from Wilmer Hale — including former US Solicitor General Seth Waxman — write. “But Defendants have not come close to making any of those showings.”

The ACLU has informed BuzzFeed News that it is representing the @ALT_USCIS user, and will be making a court filing on behalf of the user in the near future, raising statutory and constitutional arguments.

“The right to anonymously speak out against the government is clearly protected by the First Amendment. We are pleased to see Twitter standing up for its users’ rights, and the ACLU will soon be filing documents in court on behalf of this user,” ACLU attorney Nathan Freed Wessler told BuzzFeed News in a statement. “To unmask an anonymous speaker online, the government must have a strong justification. But in this case the government has given no reason at all, leading to concerns that it is simply trying to stifle dissent.”

On March 14, according to the complaint, an agent with CBP faxed a summons to Twitter, ordering it to turn over “[a]ll records regarding the twitter account @ALT_USCIS to include, User name, account login, phone numbers, mailing addresses, and I.P. addresses.”

As noted in the complaint, however, “The CBP Summons ordered Twitter to produce the records to a CBP office in Washington D.C. by 11:45 A.M. on March 13, 2017—the day before the CBP Summons was faxed to Twitter.”