WASHINGTON—A bipartisan group of U.S. senators on the Senate Homeland Security and Governmental Affairs Committee has introduced legislation to expand the federal government’s powers to act against drones deemed threatening to the public. The bill, called the Preventing Emerging Threats Act of 2018, empowers the Departments of Homeland Security and Justice to protect properties and assets when the operation of unmanned aircraft systems (UAS) pose an unacceptable risk to public ...