Every 90 days, the president must certify that Iran is still complying with the nuclear accord and that the deal, formally known as the Joint Comprehensive Plan of Action or JCPOA, remains in America's national security interest.
Political observers have warned that any unilateral action by the United States based on unsupported claims of Iranian non-compliance would isolate Washington, impede future efforts for other nonproliferation agreements in the broader global community and increase the likelihood of a wider conflict in the Middle East.
Decertifying the deal doesn't end the agreement, but is seen as the first step toward a full dismantling as it kicks the issue to Congress for debate over whether to re-institute previous sanctions.
Johnson said the agreement - under which Iran agreed to limit its nuclear program in exchange for the lifting of economic sanctions - "was the culmination of 13 years of painstaking diplomacy and has increased security, both in the region and in the UK".
Doing so has kept the U.S.in compliance with the accord, but because it's purely an issue of USA law, decertification does not matter for the deal itself.
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The president has called the Obama administration agreement the worst deal ever.
Representative Ed Royce, Republican chairman of the House Foreign Affairs Committee, said the Trump administration should preserve the deal to protect U.S. national security, even though he opposed the deal at the time. Iran has said it may exit the deal if the USA withdraws.
Why does the deal need to be certified?Under a new version being negotiated with Congress, he would have to endorse the deal less frequency but the U.S. intelligence community would have to assess whether Iran is carrying out covert activity in facilities not visited by the IAEA. Tom Cotton, R-Ark., would demand that the intelligence community produce judgments on a wide range of Iranian behavior that is not covered by the nuclear deal, including ballistic missile testing and development and threats to Israel and the Mideast more broadly. If the president doesn't certify compliance with the requirements, Congress has 60 days to decide whether to re-impose or "snap back" sanctions lifted under the agreement. "We may have to array our forces to prepare for. calibrated strikes".
But France, the United Kingdom, Germany, and the European Union - who negotiated the deal along with the U.S., China, Russia, and Iran - have all said the deal is working well and urged the U.S.to stay in it.
Iran has said it is open in principle to further discussions, particularly with Europe, but has said its missile programme is non-negotiable.
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He's like a toddler, '" she said, according to news.com.au . Then I left him to side of sheep, "he used his statements. And they didn't know what to do.
Even so, some experts told CNBC that decertification will undermine the worldwide deal and encourage hardliners in Tehran to push for nuclear weapons.
European officials expressed relief that the White House speech did not appear to represent an USA abrogation of the 2015 deal, which they had intensively lobbied against since it became clear over recent months that Trump did not want to continue to certify the deal to Congress. If those sanctions are put back into place, the JCPOA would be considered breached.
To win over some conservative Republicans and Iran hawks, Corker and other leaders are considering proposing sanctions on Iran's non-nuclear activities and broader inspections, particularly of Iranian military facilities.
Why does U.S. President Donald Trump want to scrap it?
Even Iranian hardliners who were originally opposed to the deal have joined former opponents who are fighting to remain.
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What exactly that will look like is still being determined, but it could include greater congressional oversight.