FBI Director Robert Mueller said Wednesday the bureau was surveilling the United States with drones. The revelation was during an FBI oversight hearing before the Senate Judiciary Committee and comes as the bureau, along with the National Security Agency, are on the defensive about revelations that they are obtaining metadata on Americans’ phone records and Americans’ private data from companies like Google, Facebook, Microsoft and others. The FBI is not alone in monitoring the U.S. with drones. Federal agencies use them to survey U.S. borders, help fight wildfires and survey dams after hurricanes. Dozens of local law enforcement agencies nationwide deploy the unmanned crafts, too. “Our footprint is very small. We have very few,” Mueller said in response to an inquiry on unmanned aircraft by Sen. Chuck Grassley (R-Iowa).