European ambassadors to the United States on September 25 defended the nuclear deal with Iran, saying it is working, while warning that reopening negotiations would be a nonstarter and walking away from the deal would have serious consequences.

This joint defense comes as US President Donald J. Trump, who has to certify to the US Congress by October 15 that Iran is complying with the terms of the agreement, has reiterated his displeasure with the deal.

Germany’s ambassador to the United States, Peter Wittig, said the onus is on those who seek to renegotiate the deal to prove that first, renegotiation is possible, and second, it will deliver better results. “We don’t think it will be possible to renegotiate it and we believe there is no practical, peaceful alternative to this deal,” Wittig said.

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