"It is clear to me that we have made real progress in several areas and that we have a credible way forward," Obama said.
Negotiations between the so-called P5+1 countries comprising US, Britain, France, China, Russia and Germany and Iran, enters a into the last phase in Vienna as the interim deal expires on July 20.
"As we approach a deadline of July 20th under the interim deal, there are still some significant gaps between the international community and Iran, and we have more work to do.
The US President has been briefed by the Secretary of State John Kerry at the White House yesterday afternoon after the latter returned from nuclear negotiations in Vienna.
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"Over the last six months, since the Joint Plan of Action took effect, we've made tangible progress on a range of key issues in our negotiations with the Iranians. Both the Iranians and the United States and the other members of the P5+1 have made good on the Joint Plan of Action," White House Press Secretary Josh Earnest said.
Earnest said it is clear that their track record over the last six months has been surprisingly favorable and there has been a legitimate discussion and constructive engagement between Iran and the P5+1.
"There were a lot of people who were pretty skeptical about that six months ago. That skepticism was justified, but the fact is there have been constructive conversations," he said, adding that there has been a willingness on the part of both the Iranians and the P5+1 partners to live up to the agreement.
"But nonetheless, there are four days that remain before the deadline and the fact is there are still gaps that remain.