A new intelligence bulletin is warning that domestic extremists are heightening threats before the election. The federal government sent the bulletin to state and local officials on Friday, the same day that an intruder attacked House speaker Nancy Pelosi's husband with a hammer in their San Francisco home. The joint memo from the FBI, Department of Homeland Security, National Counterterrorism Center and U.S. Capitol police warns that the "most plausible" danger comes from "lone offenders who leverage election-related issues to justify violence."