The conflict in Iran, initiated under President Trump, shows no clear end. Mr. Trump has proclaimed “We won,” while also warning the U.S. may be in a prolonged fight. There has been no obvious “rally‑’round‑the‑flag” boost for his presidency, and the longer the engagement continues, the greater the potential political damage.
After two decades in Iraq and Afghanistan, many Americans are wary of extended U.S. military commitments abroad — a sentiment that reaches into parts of Mr. Trump’s own base. Foreign policy often ranks low on voters’ priority lists, but poorly managed or prolonged military action can exact steep political costs beyond the human toll. Modern presidential history offers several examples of how drawn‑out conflicts or bungled operations erode public support.
Harry Truman: The Korean War dragged on after the 1950 invasion, lasting roughly three years and costing more than 36,000 U.S. lives. Economic strains and a military stalemate weighed on Truman’s standing; by February 1952 his approval had fallen to about 22 percent.
Lyndon B. Johnson: Johnson enjoyed a huge initial surge in approval after taking office, but U.S. escalation in Vietnam transformed that advantage into a liability. As the war deepened and public opposition grew, Johnson’s approval slipped to roughly 35 percent by August 1968. The political toll of Vietnam helped push him away from seeking another term despite major domestic accomplishments.
Jimmy Carter: The 1979–1981 Iran hostage crisis briefly rallied public sympathy, but a failed April 1980 rescue attempt in which eight service members died inflicted severe political damage. Carter’s approval fell from around 43 percent before the mission to about 31 percent by June 1980; the hostages were freed on the day Ronald Reagan took office.
George W. Bush: The Sept. 11 attacks produced a massive surge in support for Bush, with approval nearing 90 percent and strong backing for action in Afghanistan. But the 2003 Iraq invasion and the subsequent occupation became a drag as the mission faltered and violence escalated. Bush’s approval fell to roughly 31 percent by 2006 and into the mid‑20s by 2008 amid the financial crisis.
Joe Biden: The decision to withdraw U.S. forces from Afghanistan aimed to end the country’s longest war but the chaotic August 2021 evacuation undercut a central claim of restored competence. Thirteen U.S. service members died during the withdrawal, and Biden’s approval slipped from about 56 percent in June 2021 into the mid‑ and low‑40s afterward.
What this history shows is clear: military action does not guarantee sustained public support. Sudden attacks or early victories can produce temporary rallies, but maintaining backing requires clear objectives, competent execution, and credible exit plans. Without those, even presidents who start with public backing can see political capital evaporate as casualties, costs and uncertainty build. If the Iran conflict becomes a prolonged entanglement without a defined endgame, it carries the same risk of eroding the president’s standing as past foreign‑policy setbacks have done.