Iran nuke deal reached and other headlines

18-day negotiation yields landmark Iran nuclear accord. (AP)

What happens next? (NBC News)

How a Republican president could kill the Iran deal. (Politico)

Obama's calling for sentencing reform. Will it happen? (Washington Post)

South Carolina sheriff says county employee's clerical error enabled Charleston suspect to buy gun. (Wall Street Journal)

Lots of speculation, few clues about mystery beach blast in Rhode Island. (AP)

Happy Pluto Flyby Day! (NBC News)

What are you reading this morning? Let us know in the comments, please.