Iran’s Supreme Leader Ayatollah Ali Khamenei says he rejects a U.S. push for talks between the two countries because they would be aimed at imposing restrictions on Iranian missile range and its regio

Iran has sharply increased its stockpile of a critical raw material for atomic weapons, according to a confidential U.N. report.

Iran's stock of uranium close to weapons grade has jumped since December, two reports by the U.N. nuclear watchdog said on Wednesday.

The report by the Vienna-based International Atomic Energy Agency said that as of Feb. 8, Iran has 605.8 pounds of uranium enriched up to 60%.

President Donald Trump issued a warning to Iran in a Thursday letter, telling Tehran it can either "make a deal" regarding its nuclear program or face off with the U.S. "militarily."

The report from the International Atomic Energy Agency comes amid growing concerns that Iran may pursue a nuclear weapon.

"There are two ways Iran can be handled, militarily or you make a deal. I would prefer to make a deal," Trump told Fox host Maria Bartiromo.

Iran's Supreme Leader Ayatollah Ali Khamenei firmly rejected U.S. President Donald Trump's negotiation attempts over a nuclear deal, citing undue pressure. Despite openness to dialogue, Trump's 'maximum pressure' has intensified,