Iran's Supreme Leader Ayatollah Ali Khamenei on Wednesday rejected holding negotiations with the United States over a nuclear deal, as a letter was delivered from U.S. President Donald Trump calling for such talks.

Trump said on Friday he had warned Tehran in a letter it could face military action unless it agreed to talks for a nuclear deal. In a furious response on Saturday, Ayatollah Ali Khamenei said Iran would not negotiate with "bullying governments" insisting on talks.

Iranian officials have stated that they still haven't received any correspondence from President Donald Trump regarding negations.