by Andrew Beatty  with Michael Mathes in National Harbor, Maryland Agence France Presse WASHINGTON, United States (AFP) — America’s powerful gun lobby on Thursday accused its critics of exploiting a deadly Florida school shooting for political gain, as President Donald Trump responded to demands for tougher regulation with a deeply controversial call to arm teachers. National Rifle Association chief Wayne LaPierre hit back at what he called “the shameful politicization of tragedy,” fighting a rearguard […]