What will happen if President Trump decertifies the Iran nuclear deal?

Iranian President Hasan Rouhani delivers a speech during the opening session of the new Parliament in Tehran in 2016

USA officials told CNN Trump was moving forward with his decision despite the assessment by the worldwide community, which said Iran was maintaining its condtions under the Joint Comprehensive Plan of Action (JCPOA) agreement. That declaration could lead to an unraveling of the seven-nation pact and leave the United States, not Iran, as the country that balked at honoring its commitments.

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".

The president has called the Obama administration agreement the worst deal ever.

She said that U.S. would lose global trust "because a deal that America voted for just two years ago in the UN Security Council with a resolution unanimously adopted, a deal that America helped to shape enormously, enormously, would be rejected by the same country". With the threat of restoring those old sanctions and imposing new ones - as well as the threat of military force - the USA hopes to have new leverage and get Iran to accept changes to the deal.

Engel said the U.S. must "live up to our word".

Trump allies who oppose the deal have watched the president closely to see if he might buckle under pressure. "We got nothing", Trump told Fox News on Wednesday in reference to the 2015 accord negotiated with Iran by the United States and five other world powers.

After Trump made clear three months ago he would not certify Iran's compliance with the deal, his advisers moved to give him options to consider, a senior administration official said.

Serious concern has been growing on the possible United States administration's withdrawal from Iran nuclear deal. If he does not certify Iran's compliance to the conditions of the deal than congress will have to re-impose sanctions against Iran within 60 days. 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. "Once it was entered into, once it was implemented, we want to see it enforced".

"What Trump is doing is opening a very unnecessary "Pandora's box" of troubles at a time when he is unable to competently handle the crisis with North Korea's nuclear program", said Daryl Kimball, executive director of the Arms Control Association, which supports the Iran deal.

Watch Federica Mogherini's full interview with the NewsHour's Judy Woodruff on Wednesday.

The other signatories to the JCPOA - the UK, France, Germany, Russia, China and Iran, have said it is not realistic to try to renegotiate its terms.

Trump is CREATING A CRISIS if he decertifies.

First, Congress could vote to snap sanctions back into place, or Trump could refuse to sign the next round of waivers for sanctions.

Second, Trump could call for greater non-nuclear sanctions on Iran as it seeks to punish the regime without violating the deal.

US President Donald Trump's team now faces an October 15 deadline to tell Congress whether it will continue to certify that Iran is complying with the deal. But again, none of that is likely since the US would be essentially tearing up the agreement and taking the blame for whatever comes next.

The Europeans seem more inclined to try to "build" on the deal in this way. Many Democrats believe that is more likely to happen if Congress does not act to make changes to the existing agreement.

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