The National Rifle Association, the country's most influential gun-rights supporter, is challenging President Obama's new plan to use his presidential power to tighten firearms laws, calling it a "political stunt" that fails to increase public safety. President Obama said this weekend that he'll meet Monday with Attorney General Loretta Lynch to discuss his "options†toward curbing gun violence, after ordering his White House team several months ago to identify "new actions" that he can take. The president also said that he's taking action because Congress has failed to act. He is expected to use so-called executive orders to tighten federal...