Two months after the shooting of a U.S. congresswoman, President Barack Obama called Sunday for more stringent enforcement of existing gun laws, citing the “awful consequences” of gun violence in American society.

In an op-ed essay in The Arizona Daily Star, Obama says legislation to bolster criminal background checks for gun buyers hasn’t been properly implemented, with too many states providing “incomplete and inadequate” information.

He suggested rewarding states that provide the most comprehensive information to the criminal background database.

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