Via Huffington Post:

The American Civil Liberties Union and the New York Civil Liberties Union filed a lawsuit Tuesday against the Obama administration, challenging the constitutionality of the phone surveillance program revealed by The Guardian.

The suit alleges that the program violates the First and Fourth amendments.

Read the full complaint.

Rep. Justin Amash indicated on Fox News that several congressmen would likely file amicus briefs, in concert with  the ACLU action.