UNITED NATIONS - A United Nations move to frame a treaty to regulate the $70 billion global arms trade faces serious a challenge, not from any member state but from the leading US pro-gun group, the National Rifle Association (NRA).The powerful group has vowed to fight the draft international treaty while dismissing suggestions that a recent US school shooting bolstered the case for such a pact. NRA President David Keene said in a media interview that the Newtown school massacre has not changed the powerful US gun lobby’s position on the treaty. He also made clear that the Obama administration would have a fight on its hands if it brought the treaty to the US Senate for ratification. “We’re as opposed to it today as we were when it first appeared,” he was quoted as saying. “We do not see anything in terms of the language and the preamble as being any kind of guarantee of the American people’s rights under the Second Amendment.” The UN General Assembly voted on Monday to restart negotiations in mid-March on the first international treaty to regulate conventional arms trade after a drafting conference in July collapsed because the US and other nations wanted more time. Washington supported Monday’s UN vote.