Donald Trump, it appears, has never met an international agreement he wasn’t prepared to trash. On June 1, the president stepped to the podium in the Rose Garden and announced his decision to withdraw from the Paris climate accord. This followed on the heels of his reluctance to reaffirm America’s commitment to defend its NATO allies, an obligation dating back seven decades, and his decision to walk away from the Trans-Pacific Partnership, the largest multilateral trade deal in a generation. The next potential target on the president’s hit list: the Iran nuclear deal, an agreement he has called “the worst deal ever negotiated” and has pledged to dismantle.

The stakes could not be higher. The deal—officially known as the Joint Comprehensive Plan of Action—places significant and verifiable constraints on Iran’s nuclear activities, effectively blocking its pathway to an atomic bomb. If Trump exits the agreement, the prospects of a nuclear-armed Iran—or a major war to head off that outcome—would increase.

The Trump administration is in the midst of a comprehensive review of the Iran deal, and the conclusions are likely to be harsh. Indeed, in a notoriously factionalized administration, being hawkish on Iran is one of the few things that Trump officials seem to agree on.

Hostility toward the Islamic Republic starts at the top. Trump has consistently claimed that the nuclear deal requires U.S. taxpayers to provide Iran with a $150 billion “lifeline” in exchange for “nothing.” Both claims are false: The deal frees up around $60 billion of Iran’s own money, and the nuclear constraints are considerable. The president has also accused Iran of “not living up to the spirit” of the “terrible agreement,” even though his own State Department certified in April that Iran is complying with the deal. During his visit to Saudi Arabia in May, Trump singled out Iran for its support of terrorism, and even hinted at the need for regime change. And in June, after Islamic State militants attacked the Iranian parliament and the shrine of Ayatollah Khomeini, Trump noted that “states that sponsor terrorism risk falling victim to the evil they promote”—implying that Iran was asking for it.

Trump’s hard-edged perspective is shared across his administration. His national security advisor, Lt. Gen. H.R. McMaster, as well as key staffers on the National Security Council responsible for Middle East policy, forged their views of Iran at the height of the Iraq War, when U.S. troops were battling Iran’s Revolutionary Guard and its Shia militia proxies. Secretary of Defense Jim Mattis, another notable Iran hawk, commanded U.S. forces across the Middle East from 2010 to 2013—a time when his top job was preparing for a possible war with Iran to thwart its nuclear ambitions. This April, during a trip to Saudi Arabia, Mattis flatly stated: “Everywhere you look, if there’s trouble in the region, you find Iran.” Secretary of State Rex Tillerson has also expressed hard-line views, decrying the nuclear accord as a “failed approach” that does little to address the threat Iran poses across the Middle East.