After 18 days of marathon talks and 4 deadline extensions, Iran and 6 world powers have come to an agreement. Iran’s nuclear activities will be limited in exchange for relief from sanctions.
Negotiators are behind closed doors in the final plenary session.
CNN cited EU foreign policy Chief Federica Mogerini as twitting that they have an agreement. This is the first official line on the agreement.
Iranian foreign minister called it a win win situation for everybody.
Among the many stumbling blocks along the way, is getting Iran to answer questions about its possible past military use of its nuclear technology to build a weapon.
What is known so far about the deal is that Iran will have its nuclear stockpiles cut significantly, its centrifuges cut significantly and in return it would get sanctions relife.

What happens next?
Both houses of Congress now have 60 days to review the deal and hold hearings. While that is going on, the president cannot wave sanctions against Iran on his own authority.
If Congress does vote to reject the deal, the president most likely would veto that measure. Two third of each house (67 votes in Senate and 290 votes in the House) could then vote to override the veto. If that override fails, the president can seal the deal and lift those sanctions.