In 2006, in the first federal challenge ever argued against the NSA's warrantless wiretapping program, the ACLU defeated the Bush administration when a district court declared the program unconstitutional. But in July 2007, the 6th Circuit overturned that decision. The ACLU asked the Supreme Court of the United States to consider the ruling, but in February 2008, the Court declined to review the challenge.
https://www.aclu.org/cases/aclu-v-nsa-challenge-warrantless-wiretapping