Joe Biden

 But Biden has yet to tell his staff whether he will run or personally ask them to do any planning for a potential campaign, according to several people close to the vice president.

"No deal means a greater chance of more war in the Middle East," Obama said in early morning remarks from the White House.

Obama, accompanied by Vice President Joe Biden, spoke shortly after negotiators in Vienna announced the landmark deal aimed at curbing Iran's nuclear program for more than a decade in exchange for billions of dollars in international sanctions relief.