Global powers, including key US allies, have said they will stand by the Iran nuclear deal which US President Donald Trump has threatened to tear apart.
Mr Trump said on Friday that he would stop signing off on the agreement.
The UK, France and Germany responded that the pact was "in our shared national security interest". The EU said it was "not up to any single country to terminate" a "working" deal.
Iran's President Hassan Rouhani said the US was "more isolated than ever".
"Can a president annul a multilateral international treaty on his own?" he asked.
Mr Trump said on Friday that he would stop signing off on the agreement.
The UK, France and Germany responded that the pact was "in our shared national security interest". The EU said it was "not up to any single country to terminate" a "working" deal.
Iran's President Hassan Rouhani said the US was "more isolated than ever".
"Can a president annul a multilateral international treaty on his own?" he asked.
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