"In this response, although direct negotiations between the two parties are rejected, it has been stated that the path for indirect negotiations is open," Iran said.

Plus: The national implications of a court election in Wisconsin. | Some have been rescued following a 7.7-magnitude earthquake in Myanmar.

Iran's Supreme Leader Ayatollah Ali Khamenei said on Monday the U.S. would receive a strong blow if it acts on President Donald Trump's threat to bomb if Tehran does not reach a new nuclear deal with Washington.