U.S. President Donald Trump is reportedly considering a ground operation in Iran to seize around 1,000 pounds (454 kilograms) of uranium, according to unnamed American officials cited by The Wall Street Journal. The report says such an operation could require U.S. forces to remain inside Iran for several days or longer. Trump has not yet made a final decision and is weighing the risks to American troops.

Officials quoted in the report said the president views the plan positively, as it could support his goal of preventing Iran from developing nuclear weapons. White House Press Secretary Karoline Leavitt stated that Pentagon preparations do not indicate a presidential decision. The Pentagon declined to comment, and a spokesperson for U.S. Central Command also refused to respond.

Speaking to reporters on Sunday night, Trump warned that Iran must comply with U.S. demands on nuclear weapons or risk ceasing to exist as a country. He added that Iran would have to hand over all its uranium to the United States.