The Fourth Amendment Restoration and Protection Act of 2026 would fundamentally restrict how federal intelligence agencies can conduct surveillance on U.S. citizens. The bill prohibits the Foreign Intelligence Surveillance Court from authorizing electronic surveillance, physical searches, wiretaps, or other monitoring activities targeting U.S. persons, and it prevents the government from querying databases for information about American citizens without a warrant. Most significantly, the legislation bars any information obtained through these intelligence authorities from being used as evidence in criminal, civil, or administrative cases against U.S. persons, with a narrow exception allowing individuals who were surveilled to use information about themselves in their own legal proceedings. The bill also extends similar restrictions to surveillance conducted under Executive Order 12333, which governs general U.S. intelligence activities. The legislation would apply to all future intelligence operations but does not establish new funding mechanisms or implementation timelines beyond its enactment.