Trump will make the announcement in a speech at 12:45 pm EDT (1645 GMT) that will detail a more confrontational approach to Iran over its nuclear and ballistic missile programs and its financial and military support for extremist groups in the Middle East, US Secretary of State Rex Tillerson told reporters.
Trump will also give the US Treasury Department broad authority to impose economic sanctions against people and entities in the Iranian military, the Iran Revolutionary Guard, in response to what Washington calls its efforts to destabilize and undermine its opponents in the Middle East.
Trump's decision to decertify the nuclear deal will not withdraw the United States from the agreement, which was negotiated by the United States and other world powers during the administration of former President Barack Obama.
Trump will attempt to persuade the US Congress to approve some separate measures to toughen US policy toward Iran.
European officials have categorically ruled out renegotiating the deal, but have said they share Trump's concerns over Iran's destabilizing influence in the Middle East.
Worst Deal Ever
The threat of new action from Washington has prompted a public display of unity from the rival factions among Iran's rulers.
"The deal is designed to prevent a nuclear weapon. It shouldn't have a sunset clause at all," said a senior administration official.
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