OREANDA-NEWS. Negotiators from six global powers and Iran have agreed to extend the deadline for their negotiations over Tehran's nuclear program through 10 July, the US State Department said today.

The US, UK, France, Germany, Russia and China — known as the P5+1 — are trying to reach a comprehensive agreement with Iran that would swap sanctions relief for nuclear concessions. Foreign ministers from the parties have been meeting in Vienna as part of a final push to reach a deal.

The parties had hoped to conclude their negotiations by 30 June, but they have agreed to extend the deadline a second time.

"We are taking these negotiations day to day to see if we can conclude a comprehensive agreement," the State Department said. The State Department said negotiators have made "substantial progress" but "this work is highly technical and high stakes for all of the countries involved. We are frankly more concerned about the quality of the deal than we are about the clock."

To give negotiators more time, the parties are taking steps to extend the terms of an interim agreement put in place during the talks to remain in place through 10 July. US secretary of state John Kerry plans to remain in Vienna as the talks continue.

During the nuclear talks, Iran's oil exports have been limited to 1mn-1.1mn b/d. Iran produced 2.8mn b/d in May and was tied with the UAE as Opec's third largest oil producer.

Under the terms of the Iran Nuclear Agreement Review Act, Congress will have an initial 30 days to examine and debate any agreement, if Obama presents an agreement to lawmakers by 10 July.

If lawmakers are unhappy with the deal, they have an additional 12 days to adopt a resolution of disapproval. If Obama were to veto that bill, they would then have another 10 days to try to override the veto.

But if the president does not submit an agreement to Congress by 10 July, lawmakers will have up to 82 days to review any deal and try to pass legislation to block it if dissatisfied with its terms.