Usually, the UN ambassador or senior official of the country holding the presidency takes the gavel.
Protests have erupted once more in Baghdad amid the military escalation in the region.
The Israeli Defence Forces early on Tuesday said it was striking sites belonging to the Hezbollah militia in Beirut.
Germany’s foreign minister said that an attack on a NATO member state could not be ruled out following a drone strike on a British air base in Cyprus.
The U.S. government has urged Americans to immediately leave several Middle Eastern countries, including Israel and the UAE, due to serious safety risks.
Israel and the United States had on Saturday launched a major attack on Iran.
Mrs Khojasteh, 78, was married to Mr Khamenei in 1964 and was his only wife.
Israeli warplanes carried out intensive airstrikes at dawn on Monday in Beirut’s southern suburbs.
The Iranian Red Crescent said on Monday that the death toll from U.S. and Israeli airstrikes on Iran since Saturday has risen to 555.
U.S. President Donald Trump says the current armed conflict with Iran could run for four weeks.
