President Donald Trump vowed on Thursday that the United States will eventually recover Iran’s stockpile of highly enriched uranium despite comments from Iran that it will not hand over the material.

 “We will get it. We don’t need it, we don’t want it. We’ll probably destroy it after we get it, but we’re not going to let them have it,” Trump told reporters at the White House.

Iran is believed to possess about 900 pounds of highly enriched uranium, which Trump says was buried by US and Israeli airstrikes nearly a year ago.

Retrieving the uranium is part of Trump’s central objective in his war on Iran, that Tehran will not be allowed to develop a nuclear weapon.

Iran’s Supreme Leader has issued a directive that the country’s near-weapons-grade uranium should not be sent abroad, two senior Iranian sources told Reuters.