The decision to waive the sanctions was to be announced in a statement issued by the White House a day after Trump engaged in lengthy discussions with US Secretary of State Rex Tillerson, national security adviser H.R. McMaster and others about the deal.
Iran says the US has "crossed a red line" by imposing sanctions on the head of its judiciary, Ayatollah Sadeq Amoli-Larijani.
On Friday, Trump agreed to waive sanctions against Iran that were lifted as part of the international deal but said it would be the last time unless conditions were met to fix what he called "significant flaws" in the deal.
In October of last year, Trump refused to recertify that Iran was in compliance with the agreement, saying the it was "one of the worst and most one-sided transactions the US has ever entered into".
But Trump wants the pact strengthened with a separate agreement within 120 days and has said the United States would pull out of the existing accord if such steps are not taken.
Britain, France and Germany had called on Trump on Thursday to uphold the pact.
The White House wants EU signatories to agree permanent restrictions on Iran's uranium enrichment.
The stance of Iran and international support for the agreement has blocked attempts by Trump and Israel to terminate this deal or make changes to it, said the statement.
Despite the lopsided cohort in favor the deal, the president has continued to recoil at the prospect of extending sanctions to Iran given his personal animus toward the deal and campaign promise to rip up the international accord during his first term in office.
And while Trump approved a sanctions waiver, he also decided to impose new, targeted sanctions on Iran, the person said.
Iran's Foreign Ministry said Saturday that the Islamic republic will never succumb to pressure of the United States to renegotiate the 2015 nuclear deal.
Iran has complained that US sanctions not connected to nuclear activity have effectively cancelled out any financial benefits it expected from the 2015 deal.
The foreign ministry noted in an earlier note Saturday on its website that the agreement is "not a bilateral agreement that can be annulled by unilateral action". The next deadline for extending nuclear sanctions relief will come in mid-May.
On Jan. 13, French President Emmanuel Macron stressed the "necessary respect by all parties" of Iran's nuclear deal with world powers, in a telephone call with Israeli Prime Minister Benjamin Netanyahu.
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