The UN’s top court will rule whether it can take on Iran’s bid to overturn US nuclear sanctions, reimposed by the administration of former US president Donald Trump.
Tehran dragged the United States to the International Court of Justice in mid-2018, saying Washington breached a 1955 friendship treaty between the two countries.
Then-president Trump reimposed the sanctions after pulling out of a 2015 nuclear deal with Iran to the dismay of European allies.
The United States says the Hague-based ICJ does not have jurisdiction and must throw out the case.
It also argues the sanctions were necessary because Iran posed a “grave threat” to international security.
The ICJ was set up by the United Nations after World War II to rule in disputes between member states.
If the court allows the case to go ahead, a final ruling could still be months or even years away.