A top Iranian diplomat warned on Wednesday that if the United States withdraws from the Iran nuclear deal in the coming days, Tehran could resume its uranium enrichment activities. “Iran would be ready to go back to the previous situation,” Hamid Baeidinejad, Iran’s ambassador to the United Kingdom, told CNN in an interview. “It could be enriching uranium. It could be redefining our cooperation with the [International Atomic Energy Agency], and some other activities that are under consideration.” Baeidinejad also said President Donald Trump is not being “constructive.” Top lawmakers have said recently that they expect the U.S. to withdraw from the Obama-era accord because the European partners in the deal don’t appear ready to fix the agreement to the White House’s liking. By law, the Trump administration must certify by May 12 whether Tehran remains in compliance with the terms of the deal. “When the United States is out of the deal, it means there is no deal left,” Baeidinejad added.