The “historic regret” is making the deal in the first place. Now all that is left is bad options.
Iranian President Hassan Rouhani has warned that the US will face “historic regret” if Donald Trump scraps the nuclear agreement with Tehran.
Mr Rouhani’s comments come as the US president decides whether to pull out of the deal by a 12 May deadline.
Mr Trump has strongly criticised the agreement, calling it “insane”.