Iran’s president said on Thursday its nuclear accord with world powers cannot be renegotiated, after the Trump administration warned it was weighing whether the deal signed by its predecessor served U.S. security interests.

Under the 2015 deal, Iran agreed to limit its disputed nuclear program in return for the easing of economic sanctions. U.S. President Donald Trump called the deal an “embarrassment” during his first speech at the United Nations on Tuesday.

“There was some discussion by some people that the nuclear deal isn’t very bad but shouldn’t stay as it is. (That) it’s a deal that’s good but we should sit down again and debate to see if it can be improved. If it has flaws we can fix them,” Iranian President Hassan Rouhani said.

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