Firestorm erupts over GOP letter challenging Obama's power to approve Iran nuclear deal; French sports world mourns athletes who died in crash

Today on Twitter Firestorm erupts over GOP letter challenging Obama's power to approve Iran nuclear deal 43 related Tweets Fox News, New York Daily News and more are tweeting about this. French sports world mourns athletes who died in crash 14 related Tweets USA TODAY, CBS News and more are tweeting about this. Apple Watch Success Will Hinge on Apps 17 related Tweets The New York Times, Bloomberg Business and more are tweeting about this. Popular in Fashion GQ Fashion, Hunter and more are tweeting about this. Popular in Pets EverybodyLovesSammy, Cat Porn™ and more are tweeting about this. Popular in Sports Patriots News, Cyclone Insider and more are tweeting about this. Not what you're looking for? Find more Tweets by checking out Twitter's "Discover" timeline on mobile or web. Explore Twitter Email settings |  Opt-out | Help Twitter, Inc. 1355 Market Street, Suite 900 San Francisco, CA 94103