Federal lawmakers are backing lawsuits against the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) following the introduction of new gun registration requirements in several border states. The lawsuits, supported by the National Rifle Association, aim to stop the ATF from compelling firearms sellers to report multiple purchases. “The ATF has no authority to track the purchases of law-abiding gun owners and the Second Amendment Task Force applauds the lawsuit to stop this effort,” Georgia Republican Rep. Paul Broun told The Daily Caller. The task force is a 13-member, bipartisan group of lawmakers established in 2009. Broun is its co-chair....