Iranians flash the victory sign from their car while celebrating on a street in northern Tehran, Iran, April 2, 2015, after Iran's nuclear agreement with world powers in Lausanne, Switzerland. Iran and six world powers reached a preliminary nuclear agreement Thursday outlining commitments by both sides as they work for a comprehensive deal aiming at curbing nuclear activities Tehran could use to make weapons and providing sanctions relief for Iran. Reps. Robert Pittenger and Patrick McHenry warned the administration not to eliminate sanctions without congressional consent. AP