Rep. Adam Schiff Adam Bennett SchiffOvernight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies Intelligence chief says Congress will get some in-person election security briefings MORE (D-Calif.) on Friday warned President Trump’s administration against abandoning the Iran nuclear deal.

Schiff said it would be a "grave mistake" to walk away from the deal negotiated by the Obama administration, predicting it would allow Tehran to make strides on its nuclear program.

Breaking the Iran nuclear deal would be a grave mistake for the Trump Administration, unleashing Iran's nuke program again and isolating US. — Adam Schiff (@RepAdamSchiff) April 21, 2017

The State Department informed Congress on Tuesday that the U.S. would keep easing sanctions against Iran as the country complies with the nuclear pact reached between Tehran and six global powers in 2015.

President Trump has also ordered a full review of the Obama-era agreement, which he has repeatedly criticized as a failure of his predecessor.

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“Notwithstanding, Iran remains a leading state sponsor of terror through many platforms and methods,” Secretary of State Rex Tillerson wrote in a letter to Speaker Paul Ryan Paul Davis RyanAt indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates Peterson faces fight of his career in deep-red Minnesota district MORE (R-Wis.) on Tuesday.

Tillerson added that the National Security Council will review the details of the deal, which is formally known as the Joint Comprehensive Plan of Action (JCPOA).

"[The review] will evaluate whether suspension of sanctions related to Iran pursuant to the JCPOA is vital to the national security interests of the United States,” he said.

The State Department must update Congress on Iran’s compliance with the JCPOA every 90 days, with Tuesday marking the first report issued under the Trump administration.

The JCPOA reduced economic sanctions against Iran in exchange for greater restrictions on its nuclear energy program.

Trump said Thursday that Iran is “not living up to the spirit of the agreement,” adding he considers the overall accord “terrible.”

“It shouldn’t have been signed,” Trump said in the White House’s East Room. “It shouldn’t have been negotiated the way that it was negotiated. And we are analyzing it very carefully, and we will have something to say about it in the not-too-distant future."