Just a week after Sen. John Fetterman helped Republicans block a war powers resolution intended to halt President Donald Trump and Israel’s assault on Iran, the Pennsylvania Democrat again bucked his own party on Wednesday by not signing on to a letter calling for a probe into an apparent US bombing of a girls’ school in the Iranian city Minab that killed around 175 people, mostly young children.As with the unsuccessful resolution from Sen. Tim Kaine (D-Va.), Fetterman was the only member of the Senate Democratic Caucus—which includes Sens. Bernie Sanders (I-Vt.) and Angus King (I-Maine)—who didn’t endorse the letter to US Defense Secretary Pete Hegseth.Fetterman has signaled support for Operation Epic Fury and promoted Trump’s narrative that it’s motivated by preventing Iran from developing a nuclear weapon. During a Tuesday appearance on Newsmax, he claimed that “negotiating treaties” and coordinating with regional allies “never worked,” and wondered why Democrats can’t “agree what’s happened is a very, very positive development for world peace.”Asked for comment about Democrats’ letter, Fetterman told Reuters that he supports the military operation and “the United States never intentionally targets civilians, including its own citizens, unlike Iran. Everyone agrees it was a tragedy. Everyone agrees on performing a full investigation.”A spokesperson for Fetterman added that “whether the senator is on a letter or not, he fully stands behind a comprehensive investigation into this tragedy.”Led by Kaine, Senate Minority Leader Chuck Schumer (D-NY), and Sens. Brian Schatz (D-Hawaii), Chris Van Hollen (D-Md.), and Elizabeth Warren (D-Mass.), the rest of the caucus began the letter by expressing “grave concern” about the bombing—which paramedics and victims’ relatives have said was a so-called “double-tap” airstrike—and stressing that the 12-day assault “is a war of choice without congressional authorization.”“Nonetheless, as these military actions continue, the United States and Israel must abide by US and international law, including the law of armed conflict,” they wrote. “There must be a swift investigation into the strikes on this school and any other potential US military actions causing civilian harm, and the findings must be released to the public as soon as possible, along with any measures to pursue accountability.”“Massive civilian casualty incidents like the attack in Minab are not only detrimental to the Iranian people, who have already suffered so much at the hands of its own government, but they also undermine US national security interests,” the Democrats argued.The letter cites a Tuesday update from the US-based Human Rights Activists News Agency that the war has killed more than 1,245 civilians and injured over 12,000. The Iranian government said earlier this week that the death toll is above 1,300.The Senate Democrats didn’t just focus on the school; they also sounded the alarm about US and Israeli “use of explosive weapons in major Iranian cities and populated areas,” which has damaged “multiple hospitals, cultural heritage sites, and other critical civilian infrastructure.”“These civilian harm events are not taking place in a vacuum,” the senators wrote, pointing to Hegseth’s recent remarks that Operation Epic Fury would have “no stupid rules of engagement” and there will be “death and destruction from the sky all day long.”They warned that “this rhetoric only serves to endanger civilians, including American citizens, in the region and around the globe. The United States is a party to the Geneva Conventions and bound by international humanitarian law, including the principles of distinction, proportionality, and precaution. These are binding and non-negotiable standards designed to protect innocent human life, and it is unacceptable for the secretary of defense to suggest otherwise.”“Your comments reflect a broader pattern of policies abandoning the Defense Department’s commitment to minimizing civilian harm in US military operations,” the lawmakers noted, referencing budgetary and personnel cuts, including the removal of senior, nonpartisan judge advocate general officers. “These actions, combined with your comments and the horrific reports of civilian casualties stemming from the war against Iran, suggest the administration has abandoned its duty to protect civilians.”The senators demanded Hegseth’s responses to a list of questions about the February 28 school strike, compliance with rules to prevent war crimes, the military’s efforts to prevent and mitigate civilian harm, and the use of artificial intelligence no later than March 18.The Wednesday letter came as the The New York Times reported on the preliminary findings of a Pentagon probe that found the strike on the school in Minab “was the result of a targeting mistake by the US military, which was conducting strikes on an adjacent Iranian base of which the school building was formerly a part.”It also came as a coalition of peace...