Obama says Iran nuclear deal successful but more work needed

Obama, speaking after a meeting of the six world powers that reached the deal with Tehran last summer, said the road to that agreement was not easy.

"Full and continued implementation is going to take the same kind of cooperation and consultation," Obama said at the Nuclear Security Summit. "This deal does remind us that when the international community stands as one we can advance our common security."

The U.S. president said it will take time for Iran to reintegrate into the global economy.

"This is a success of diplomacy that hopefully we'll be able to copy in the future," Obama told reporters.