Key GOP leaders came to woo the NRA's annual convention this weekend, one sign of the group's growing clout.
He vows to support a regional treaty to curb gun trafficking as well as greater cooperation on clean energy.
Most are, say US officials. But the NRA says the Obama administration is inflating the scope of the problem and threatens to undermine the Second Amendment.
The deaths in North Carolina and California follow other high-profile shootings in recent weeks.