The president's trip to Atlanta also will serve as his first foray into a congressional race since taking office.
Trump is expected to attend a private fundraiser for Republican congressional candidate Karen Handel, a local election that has become a national referendum on his presidency.
Trump has been a champion of gun rights and supportive of NRA efforts to loosen restrictions on gun ownership. During the campaign, he promised to do away with President Barack Obama's efforts to strengthen background checks and to eliminate gun-free zones at schools and military bases.
The NRA is pushing for federal legislation to make any state's concealed-carry permits valid nationwide. Opponents say the move would effectively turn the weakest gun standards in the nation into the law of the land.
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The GOP-led Congress already passed a resolution to block a rule that would have kept guns out of the hands of certain people with mental disorders, and Trump quickly signed it.
He stirred controversy during the campaign when he suggested that "Second Amendment people" could stop his opponent Hillary Clinton, which some interpreted to be a call for violence against the Democratic nominee. Trump disputed that charge.
Kevin Michalowski, executive editor of the Concealed Carry magazine published by the United States Concealed Carry Association, said seeing that a president will be addressing the annual meeting "gives the gun industry a feeling of he's on our side."
After addressing NRA members, Trump is scheduled to attend a private fundraiser for Republican congressional candidate Karen Handel. It's the president's first such endeavor for a congressional hopeful since taking office and confirmation that the GOP sees Georgia's 6th Congressional District runoff as a barometer of the 2018 midterm elections.
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