The statement published Tuesday on the website of the magazine of The National Interest, a conservative think tank, was responding to reports that Trump is considering refusing to certify Iran’s compliance with the Joint Comprehensive Plan of Action, which trades sanctions relief for a rollback of Iran’s nuclear program, when the next assessment period comes around in October.

“The international agreement with Iran continues to prevent Iran from acquiring a nuclear weapon. No American national security objective would be served by withdrawing from it as long as Iran is meeting the agreement’s requirements. To the contrary, given continuing assurance by the International Atomic Energy Agency (IAEA) that Iran is in compliance with the agreement, the Joint Comprehensive Plan of Action (JCPOA), such a unilateral act would have grave long term political and security consequences for the United States,” read the statement signed by nearly 50 men and women who were either former senior officials of the U.S. government or prominent national security leaders who have not held senior government positions.

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The signers recommend a “comprehensive policy toward Iran that furthers U.S. national security interests,” including: American leadership in the JCPOA; a follow-up agreement adding further guarantees for farther into the future; an additional consultative body on major disputes in the area; establishing a regular channel of communication at a senior level between the U.S. and Iran; and begin regular consultations with U.S. allies and partners in the region to share information and coordinate strategies.

The warn that a U.S. rejection of the JCPOA could push Iran to return to its pre-agreement nuclear enrichment program at full strength and under far weaker international monitoring.

Trump last month recertified Iran’s adherence to the 2015 deal brokered by President Barack Obama. But he did so reluctantly, at the behest of his national security adviser, H.R. McMaster; his defense secretary, James Mattis; and his secretary of state, Rex Tillerson. They argued that decertification would alienate U.S. allies because Iran is indeed complying with the deal’s strictures.

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However, within days of giving the go-ahead to recertify, Trump reportedly tasked a separate team, led by his top strategic adviser, Stephen Bannon, to come up with a reason to decertify Iran at the next 90-day assessment in October.

The signers include: Amb. (ret.) Morton Abramowitz, former assistant secretary of state for Intelligence and Research, Ambassador to Thailand and Turkey; Robert Einhorn, former assistant secretary for Nonproliferation and secretary of state’s special advisor for Nonproliferation and Arms Control; Morton Halperin, former director of Policy Planning at the State Department; Amb. Daniel Kurtzer, former ambassador to both Israel and Egypt; Carl Levin, former U.S. senator and chairman of the Senate Committee on Armed Services; and Barnett Rubin, former senior adviser to the Special Representative for Afghanistan and Pakistan.