Former President Barack Obama re-emerged to chide his successor for withdrawing the United States from an international agreement regulating Iran's nuclear activities.

Obama said in a long statement that he posted to social media accounts that Donald Trump had made "a serious mistake" in reneging on the obligations the US agreed to when it signed on to the accord, the Daily Mail reports.

"Without the JCPOA, the United States could eventually be left with a losing choice between a nuclear-armed Iran or another war in the Middle East," he said.

Former President Barack Obama today criticised his predecessor for withdrawing the United States from an international agreement regulating Iran's nuclear activities. Photo / Getty Images
Former President Barack Obama today criticised his predecessor for withdrawing the United States from an international agreement regulating Iran's nuclear activities. Photo / Getty Images

If the deal falls apart because of Trump's action, Obama warned, "We could be hastening the day when we are faced with the choice between living with that threat, or going to war to prevent it."

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Lecturing the sitting president, Obama explained that his administration knew that the 2015 accord it helped to negotiate would not address every Iranian threat.

"We were clear-eyed that Iran engages in destabilising behaviour – including support for terrorism, and threats toward Israel and its neighbours," he said. "But that's precisely why it was so important that we prevent Iran from obtaining a nuclear weapon."

"Every aspect of Iranian behavior that is troubling is far more dangerous if their nuclear program is unconstrained. Our ability to confront Iran's destabilising behavior – and to sustain a unity of purpose with our allies – is strengthened with the JCPOA, and weakened without it."

Obama's secretary of state at the time the US and Europe joined the alliance with China, Russia and Europe - John Kerry - also spoke out against Trump's decision.

"Instead of building on unprecedented non proliferation verification measures, this decision risks throwing them away and dragging the world back to the brink we faced a few years ago," Kerry said in a statement. "The extent of the damage will depend on what Europe can do to hold the nuclear agreement together, and it will depend on Iran's reaction."

Kerry said that Trump, who he did not reference by name, should not have outsourced that responsibility to Europe. 'This is not in America's interests,' he added.

Former US Secretary of State John Kerry. Photo / AP
Former US Secretary of State John Kerry. Photo / AP

Trump has personally assailed Kerry for settling for the deal at hand instead of pushing for something that had more teeth. He mocked the ex-diplomat in a Friday speech for a bike accident Kerry had during talks with Iran in 2015 in France.

The president had already spoken out about Kerry's "shadow diplomacy" on Monday following news reports that the Obama administration official has secretly met with foreign governments in a bid to save the much-maligned deal.

He blasted Kerry again on Tuesday morning for huddling with foreign dignitaries, including the foreign minister of Iran and the presidents of France and Germany, in the lead-up to the announcement.

"John Kerry can't get over the fact that he had his chance and blew it! Stay away from negotiations John, you are hurting your country!" Trump said.

In a Monday tweet he harangued Kerry for the meetings and for creating the 'mess' the United States now finds itself in.

"The United States does not need John Kerry's possibly illegal Shadow Diplomacy on the very badly negotiated Iran Deal,' the president wrote. 'He was the one that created this MESS in the first place!"

Former Prime Minister of New Zealand former UNDP Administrator Helen Clark also tweeted about the Iran deal:

Since leaving office, Obama has kept a promise to extract himself from the political debate, except in instances when Trump has taken direct aim at policies that defined the two-term Democrat's presidency.

He said when he left office that although he would remain living in Washington, D.C. he planned to leave the duly elected president to the business of running the government.

Obama has only inserted himself in the conversation on two notable occasions last year: when Congress sought to unravel Obamacare and when Trump announced his decision to rip the U.S. out of the Paris climate agreement.

President Donald Trump shows a signed Presidential Memorandum after delivering a statement on the Iran nuclear deal from the Diplomatic Reception Room of the White House. Photo / AP
President Donald Trump shows a signed Presidential Memorandum after delivering a statement on the Iran nuclear deal from the Diplomatic Reception Room of the White House. Photo / AP

His statement on Trump's intent to bring Iran to its knees by slapping it with a load of sanctions noted that there will inherently be changes in U.S. policy from one administration to the next.

"But the consistent flouting of agreements that our country is a party to risks eroding America's credibility, and puts us at odds with the world's major powers," he said.

"Going forward, I hope that Americans continue to speak out in support of the kind of strong, principled, fact-based, and unifying leadership that can best secure our country and uphold our responsibilities around the globe," he challenged.

BARACK OBAMA'S STATEMENT ON THE IRAN NUCLEAR DEAL

There are few issues more important to the security of the United States than the potential spread of nuclear weapons, or the potential for even more destructive war in the Middle East. That's why the United States negotiated the Joint Comprehensive Plan of Action (JCPOA) in the first place.

The reality is clear. The JCPOA is working – that is a view shared by our European allies, independent experts, and the current U.S. Secretary of Defense. The JCPOA is in America's interest – it has significantly rolled back Iran's nuclear program. And the JCPOA is a model for what diplomacy can accomplish – its inspections and verification regime is precisely what the United States should be working to put in place with North Korea. Indeed, at a time when we are all rooting for diplomacy with North Korea to succeed, walking away from the JCPOA risks losing a deal that accomplishes – with Iran – the very outcome that we are pursuing with the North Koreans.

That is why today's announcement is so misguided. Walking away from the JCPOA turns our back on America's closest allies, and an agreement that our country's leading diplomats, scientists, and intelligence professionals negotiated. In a democracy, there will always be changes in policies and priorities from one Administration to the next. But the consistent flouting of agreements that our country is a party to risks eroding America's credibility, and puts us at odds with the world's major powers.

Debates in our country should be informed by facts, especially debates that have proven to be divisive. So it's important to review several facts about the JCPOA.

First, the JCPOA was not just an agreement between my Administration and the Iranian government. After years of building an international coalition that could impose crippling sanctions on Iran, we reached the JCPOA together with the United Kingdom, France, Germany, the European Union, Russia, China, and Iran. It is a multilateral arms control deal, unanimously endorsed by a United Nations Security Council Resolution.

Second, the JCPOA has worked in rolling back Iran's nuclear program. For decades, Iran had steadily advanced its nuclear program, approaching the point where they could rapidly produce enough fissile material to build a bomb. The JCPOA put a lid on that breakout capacity. Since the JCPOA was implemented, Iran has destroyed the core of a reactor that could have produced weapons-grade plutonium; removed two-thirds of its centrifuges (over 13,000) and placed them under international monitoring; and eliminated 97 percent of its stockpile of enriched uranium – the raw materials necessary for a bomb. So by any measure, the JCPOA has imposed strict limitations on Iran's nuclear program and achieved real results.

Third, the JCPOA does not rely on trust – it is rooted in the most far-reaching inspections and verification regime ever negotiated in an arms control deal. Iran's nuclear facilities are strictly monitored. International monitors also have access to Iran's entire nuclear supply chain, so that we can catch them if they cheat. Without the JCPOA, this monitoring and inspections regime would go away.

Fourth, Iran is complying with the JCPOA. That was not simply the view of my Administration. The United States intelligence community has continued to find that Iran is meeting its responsibilities under the deal, and has reported as much to Congress. So have our closest allies, and the international agency responsible for verifying Iranian compliance – the International Atomic Energy Agency (IAEA).

President Donald Trump delivers a statement on the Iran nuclear deal from the Diplomatic Reception Room of the White House. Photo / AP
President Donald Trump delivers a statement on the Iran nuclear deal from the Diplomatic Reception Room of the White House. Photo / AP

Fifth, the JCPOA does not expire. The prohibition on Iran ever obtaining a nuclear weapon is permanent. Some of the most important and intrusive inspections codified by the JCPOA are permanent. Even as some of the provisions in the JCPOA do become less strict with time, this won't happen until ten, fifteen, twenty, or twenty-five years into the deal, so there is little reason to put those restrictions at risk today.

Finally, the JCPOA was never intended to solve all of our problems with Iran. We were clear-eyed that Iran engages in destabilising behavior – including support for terrorism, and threats toward Israel and its neighbours. But that's precisely why it was so important that we prevent Iran from obtaining a nuclear weapon. Every aspect of Iranian behavior that is troubling is far more dangerous if their nuclear program is unconstrained. Our ability to confront Iran's destabilising behavior – and to sustain a unity of purpose with our allies – is strengthened with the JCPOA, and weakened without it.

Because of these facts, I believe that the decision to put the JCPOA at risk without any Iranian violation of the deal is a serious mistake. Without the JCPOA, the United States could eventually be left with a losing choice between a nuclear-armed Iran or another war in the Middle East. We all know the dangers of Iran obtaining a nuclear weapon. It could embolden an already dangerous regime; threaten our friends with destruction; pose unacceptable dangers to America's own security; and trigger an arms race in the world's most dangerous region. If the constraints on Iran's nuclear program under the JCPOA are lost, we could be hastening the day when we are faced with the choice between living with that threat, or going to war to prevent it.

In a dangerous world, America must be able to rely in part on strong, principled diplomacy to secure our country. We have been safer in the years since we achieved the JCPOA, thanks in part to the work of our diplomats, many members of Congress, and our allies. Going forward, I hope that Americans continue to speak out in support of the kind of strong, principled, fact-based, and unifying leadership that can best secure our country and uphold our responsibilities around the globe.