When conducting investigations of the executive branch, congressional committees and Members of Congress generally receive the information required for legislative needs. If agencies fail to cooperate or the President invokes executive privilege, Congress can turn to a number of legislative powers that are likely to compel compliance. The two techniques described in this report are the issuance of subpoenas and the holding of executive officials in contempt. These techniques usually lead to an accommodation that meets the needs of both branches. Litigation is used at times, but federal judges generally encourage congressional and executive parties to settle their differences out of court. The specific examples in this report explain how information disputes arise and how they are resolved.

This report provides an overview of federal law governing wiretapping and electronic eavesdropping. It also appends citations to state law in the area and contains a bibliography of legal commentary as well as the text of the Electronic Communications Privacy Act (ECPA) and the Foreign Intelligence Surveillance Act (FISA). This report also includes a brief summary of the recently expired Protect America Act, P.L. 110-55 and of the Foreign Intelligence Surveillance Act of 1978 Amendments Act of 2008, P.L. 110-261 (H.R. 6304).