Jill Colvin and Lisa Marie Pane INDIANAPOLIS (AP) — With pro-gun legislation largely stalled in Congress, US President Donald Trump said Friday he is withdrawing the US from an international agreement on the arms trade, telling the National Rifle Association the treaty is “badly misguided.” Trump made the announcement as he vowed to fight for gun rights and implored members of the nation’s largest pro-gun group — struggling to maintain its influence — to rally behind his re-election bid. “It’s under assault,” he said of the constitutional right to bear…