The White House, facing fierce criticism from the gun lobby, has delayed approval of a proposed rule that federal law enforcement officials say could help them stanch the flow of U.S. assault rifles and other high-powered weapons to Mexico's drug cartels. The proposed rule, announced by Alcohol, Tobacco and Firearms acting director Kenneth Melson on Dec. 20, would require U.S. firearms dealers in four southwest border states to report multiple sales of long guns, such... (GunPolicy.org)