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.

Iranian Foreign Minister Abbas Araghchi received a letter from U.S. President Donald Trump on Wednesday, delivered to Tehran by a high-ranking diplomat from the United Arab Emirates, Iranian media reported.

With sanctions squeezing its economy, Iran is exploring the possibility of talks with the United States while resisting pressure to make major concessions. But he believes Iran has "no choice but to negotiate" with the United States.