Iran has kept the door open to negotiations with the incoming Donald Trump administration, while warning the US president-elect that any attempt to reimpose “maximum pressure” on the Islamic republic would fail to extract concessions.

Republicans are split over how aggressive the next Trump administration should be toward Tehran as the president-elect pursues an America-first foreign policy.

The Biden administration had warned that the United States would consider any Iranian attempt on Mr. Trump’s life to be “an act of war,” officials said.