"If the feeling is that the United States no longer supports the agreement, then the political reality is that the agreement will be in serious jeopardy and its implementation will be very hard", a senior French diplomat said. Second, it appears that moderate Senate Republicans will side with Democrats to block passage of any sanctions that could endanger the Iran deal.
Under the 2015 deal, Tehran agreed to roll back its nuclear program in exchange for relief from wide-ranging oil, trade and financial sanctions that had choked the Iranian economy.
British Prime Minister Theresa May and French President Emmanuel Macron both spoke to Trump this week to express their concerns about the potential decision not to recertify the Iran deal. The Iran Nuclear Agreement Review Act of 2015 is a bipartisan piece of legislation that was overwhelmingly passed by Congress before being opposed -- but eventually signed - by President Obama.
Trump has certified the deal twice, once in April and once in July, although he has said he did not want to do it.
Senior U.S. officials, European allies and prominent U.S. lawmakers have told Trump that refusing to certify the deal would leave the U.S. isolated, concede the diplomatic high ground to Tehran, and ultimately risk the unraveling of the agreement.
Engel said the USA must "live up to our word". He called Trump's move to kick the deal to Congress a "trap" and "a tactic meant to reach the president's goal of tearing the deal apart". But Trump more recently has said he does not expect to certify Iran's compliance with the October deadline looming.
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. 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.
Deutch said the danger of walking away from the agreement is that those expiration dates "would have effectively dropped from a decade to a day" because Iran would be freed of its obligations under the deal. "Once it was entered into, once it was implemented, we want to see it enforced".
Watch Federica Mogherini's full interview with the NewsHour's Judy Woodruff on Wednesday.
Trump is CREATING A CRISIS if he decertifies.
Mogherini noted that the global community, including the European Union and other U.S. allies, will continue to abide by the deal even if Trump chooses not to certify Iran's compliance, something which has been confirmed eight times by the worldwide Atomic Energy Agency (IAEA).
Drafts of two proposals seen by The Associated Press, one from Senate Foreign Relations Committee chairman Bob Corker and one from committee member and harsh deal critic Senator Tom Cotton, would expand the United States certification criteria to include items that are also the province of the UN nuclear watchdog and require the USA intelligence community to determine if Iran is carrying out illicit activity in facilities to which the International Atomic Energy Agency does not have access.
Trump threatened during the presidential campaign to tear the pact up if he was elected.
However, they do not believe he will go beyond that and call for Congress to reinstate nuclear sanctions that were lifted as a result of the deal.
What exactly that will look like is still being determined, but it could include greater congressional oversight.