Israeli Prime Minister Benjamin Netanyahu will make a televised statement on Monday regarding a "significant development" about the Iranian nuclear deal.
The Israeli leader's office said the announcement will focus on the 2015 agreement with world powers that sought to rein in Tehran's nuclear programme in return for sanctions relief. It will take place from the Israeli military headquarters in Tel Aviv.
It did not provide further details.
The statement follows US Secretary of State Mike Pompeo's visit on Sunday and a telephone conversation between Mr Netanyahu and US President Donald Trump on Saturday.
"We remain deeply concerned about Irans dangerous escalation of threats towards Israel and the region", Pompeo said alongside Netanyahu on Sunday.
Netanyahu said that he believes "the greatest threat to the world and to our two countries, and to all countries, is the marriage of militant Islam with nuclear weapons, and specifically the attempt of Iran to acquire nuclear weapons".
Mr Netanyahu has long criticized the deal and welcomed the Trump administration's pledge to withdraw next month if it is not improved.