AP- The head of Iran�s nuclear agency warned the United States on Tuesday against undermining the 2015 nuclear deal, saying international nonproliferation efforts as well as Washington�s international standing would suffer as a result.

Iranian nuclear chief Ali Akbar Salehi told an international conference on enhancing nuclear safety that Washington�s recent �delusionary negative postures do not augur well� for keeping the deal intact.

He said Iran didn�t want to see the deal unravel but that �much more is at stake for the entire international community than the national interests of Iran.�

U.S. President Donald Trump is set to deliver a speech on Iran this week in which he is expected to decline to certify Iran�s compliance in the landmark 2015 agreement, referring it to Congress, and perhaps targeting the country�s paramilitary Revolutionary Guard with new sanctions.

Salehi praised the progress that had been made since the 2015 deal, saying nonproliferation and disarmament efforts had benefited worldwide. He called it �simply too precious to be allowed to be undermined or weakened.�

�The failure of the nuclear deal will undermine the political credibility and international stature of the U.S. in this tumultuous political environment,� Salhehi warned.

He concluded that he hoped �common sense shall prevail.�

The U.S. administration has faced two 90-day certification deadlines to state whether Iran is meeting the conditions needed to continue enjoying sanctions relief under the deal and has both times backed away from a showdown. But Trump more recently has said he does not expect to certify Iran�s compliance with the October deadline looming.

On Monday, the European Union�s foreign policy chief, Federica Mogherini, praised the 2015 deal as a �win-win� solution that was working.

�We settled a milestone for nonproliferation and we prevented a dangerous devastating military escalation,� she told the conference via video message, adding that the International Atomic Energy Agency had certified Iran�s compliance with the deal, including via inspections, eight times since it was signed.

She warned that with rising nuclear tensions on the Korean peninsula, �We have an interest and a responsibility and a duty to preserve the nuclear deal with Iran� and strengthening, not weakening the nonproliferation regime.

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This story has been corrected to give the word in Salehi�s quote as �delusionary� instead of �illusory