This deal demonstrates that American diplomacy can bring about real and meaningful change - change that makes our country, and the world, safer and more secure. This deal is also in line with the tradition of American leadership. It's now more than 50 years since President John F Kennedy stood before the American people and said, "Let us never negotiate out of fear, but let us never fear to negotiate." He was speaking then about the need for discussions between the United States and the Soviet Union, which led to efforts to restrict the spread of nuclear weapons.
In those days, the risk was a catastrophic nuclear war between two super powers. In our time, the risk is that nuclear weapons will spread to more and more countries, particularly in the Middle East, the most volatile region in the world.
Today, because America negotiated from a position of strength and principle, we have stopped the spread of nuclear weapons in this region. Because of this deal, the international community will be able to verify that the Islamic Republic of Iran will not develop a nuclear weapon.
This deal meets every single one of the bottom lines that we established when we achieved a framework earlier this spring. Every pathway to a nuclear weapon is cut off. And the inspection and transparency regime necessary to verify that objective will be put in place. Because of this deal, Iran will not produce the highly enriched uranium and weapons-grade plutonium that form the raw materials necessary for a nuclear bomb.
Because of this deal, Iran will remove two-thirds of its installed centrifuges - the machines necessary to produce highly enriched uranium for a bomb - and store them under constant international supervision. Iran will not use its advanced centrifuges to produce enriched uranium for the next decade. Iran will also get rid of 98 per cent of its stockpile of enriched uranium.
To put that into perspective, Iran currently has a stockpile that could produce up to 10 nuclear weapons. Because of this deal, that stockpile will be reduced to a fraction of what would be required for a single weapon. This stockpile limitation will last for 15 years.
Because of this deal, Iran will modify the core of its reactor in Arak so that it will not produce weapons-grade plutonium. And it has agreed to ship the spent fuel from the reactor out of the country for the lifetime of the reactor. For at least the next 15 years, Iran will not build any new heavy-water reactors.
Because of this deal, we will, for the first time, be in a position to verify all of these commitments. That means this deal is not built on trust; it is built on verification. Inspectors will have 24/7 access to Iran's key nuclear facilities.
Iran inspectors will have access to the country's entire nuclear supply chain - its uranium mines and mills, its conversion facility, and its centrifuge manufacturing and storage facilities. This ensures that Iran will not be able to divert materials from known facilities to covert ones. Some of these transparency measures will be in place for 25 years.
Because of this deal, inspectors will also be able to access any suspicious location. Put simply, the organisation responsible for the inspections, the International Atomic Energy Agency, will have access where necessary, when necessary. That arrangement is permanent.
Finally, Iran is permanently prohibited from pursuing a nuclear weapon under the Nuclear Non-Proliferation Treaty, which provided the basis for the international community's efforts to apply pressure on Iran.
As Iran takes steps to implement this deal, it will receive relief from the sanctions that we put in place because of Iran's nuclear programme - both America's own sanctions and sanctions imposed by the United Nations Security Council. This relief will be phased in. Iran must complete key nuclear steps before it begins to receive new sanctions relief. And over the course of the next decade, Iran must abide by the deal before additional sanctions are lifted, including five years for restrictions related to arms, and eight years for restrictions related to ballistic missiles.
All of this will be memorialised and endorsed in a new United Nations Security Council resolution. And if Iran violates the deal, all of these sanctions will snap back into place. So there's a very clear incentive for Iran to follow through, and there are very real consequences for a violation.
As the American people and Congress review the deal, it will be important to consider the alternative. Consider what happens in a world without this deal. Without this deal, there is no scenario where the world joins us in sanctioning Iran until it completely dismantles its nuclear programme. Nothing we know about the Iranian government suggests that it would simply capitulate under that kind of pressure. And the world would not support an effort to permanently sanction Iran into submission. We put sanctions in place to get a diplomatic resolution, and that is what we have done.
Without this deal, there would be no agreed-upon limitations for the Iranian nuclear programme. Iran could produce, operate and test more and more centrifuges. Iran could fuel a reactor capable of producing plutonium for a bomb. And we would not have any of the inspections that allow us to detect a covert nuclear weapons programme. In other words, no deal means no lasting constraints on Iran's nuclear programme.
Such a scenario would make it more likely that other countries in the region would feel compelled to pursue their own nuclear programs, threatening a nuclear arms race in the most volatile region of the world. It would also present the United States with fewer and less effective options to prevent Iran from obtaining a nuclear weapon.
For this reason, I believe it would be irresponsible to walk away from this deal.
Edited extract of a statement by US President Barack Obama on the agreement reached with Iran on inspection of its nuclear facilities, 14 July 2015, in Washington, United States.