Mike Howse, left, helps David Foley as he shops for a handgun at the Spring Guns and Ammo store Monday, Jan. 4, 2016, in Spring, Texas. President Barack Obama defended his plans to tighten the nation's gun-control restrictions on his own, insisting Monday that the steps he'll announce fall within his legal authority and uphold the constitutional right to own a gun. (AP Photo/David J. Phillip)