OKLAHOMA CITY -- Oklahoma's Republican Gov. Mary Fallin vetoed a bill late Friday that would have authorized adults to carry firearms without a permit or training, dealing a rare defeat to the National Rifle Association[1] in a conservative state. The NRA had supported the bill's passage and had urged Fallin to sign it. 

The veto comes after opposition from the business community and law enforcement authorities, including top officials with the Oklahoma State Bureau of Investigation who have said it could erode public safety. 

In a statement announcing her veto, Fallin stressed her support for the Second Amendment and the right to bear arms and noted she had signed concealed and open carry measures in the past. 

"I believe the firearms laws we currently have in place are effective, appropriate and minimal," she said. But she added that the bill would have eliminated the requirement for a training course and reduced the level of background checks to carry a gun.

The bill is similar to so-called "constitutional carry" legislation adopted in a dozen other states. It would have authorized people 21 and older and military personnel who are at least 18 to legally carry a handgun, either openly or concealed, without a state-issued license or permit.

The state currently requires a license to carry a handgun openly or concealed.

The NRA issued a statement in Washington blasting Fallin for what it was going back on her commitment to support such a gun carry law when she ran for re-election in 2014.

"Make no mistake, this temporary setback will be rectified when Oklahoma residents elect a new and genuinely pro-Second Amendment governor," said Chris Cox, NRA executive director for legislative affairs.

The state bureau of investigation, which issues handgun licenses, had

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