On December 23, 2008, the U.S. Chamber of Commerce announced that it had filed a lawsuit in the U.S. District Court for the District of Maryland challenging the legality of an executive order and related federal procurement law that requires federal contractors to use E-Verify (Chamber of Commerce of the United States of Am. v. Chertoff, D. Md., No. 8:08-cv-03444-AW, filed 12/23/2008). Joining the U.S. Chamber as co-plaintiffs in the lawsuit are the Associated Builders and Contractors, the Society for Human Resources Management, the American Council on International Personnel, and the HR Policy Association.