President Donald Trump says he's left standing orders for the U.S. military to destroy Iran "at levels they've never seen before" if Tehran assassinates him. But the U.S. government has no mechanism to create an automatic, preauthorized military response. If Trump were killed, Vice President JD Vance would immediately become commander in chief under the 25th Amendment and the Presidential Succession Act of 1947—and he'd decide whether to follow through.
That means Vance could execute Trump's orders. Or he could ignore them entirely.
No 'Dead Man's Switch' Exists
Garrett M. Graff, author of "Raven Rock: The Story of the U.S. Government's Secret Plan to Save Itself—While the Rest of Us Die," said the U.S. has "for a whole variety of reasons, never utilized a technical 'dead man's switch.'" The country does maintain extensive continuity-of-government plans for nuclear attack or catastrophic events, but none allow for immediate retaliatory strikes upon a president's death—even if that president demanded military readiness.
Trump posted on his social media website Saturday that Iran had made threats "to assassinate, or attempt to assassinate" him. He claimed 1,000 "missiles are Locked and Loaded and aimed at the Islamic Republic of Iran, with thousands more to immediately follow, should the Iranian Government act on its threat." Hours later, Iran's supreme leader, Mojtaba Khamenei, said Iranians would continue to avenge the killing of his father, Ayatollah Ali Khamenei. The elder Khamenei died in the initial U.S. and Israeli strikes that started the war in late February this year, and he was mourned in funeral events throughout Iran this week.
"We pledge to take revenge for the pure blood of you and all the martyrs of these two wars from the criminal and disgraceful killers," Mojtaba Khamenei said in remarks aired on state television. "This revenge is the will of our nation and must certainly be carried out." During those funeral events, mourners repeatedly held posters or banners calling for Trump to be killed along with Israeli Prime Minister Benjamin Netanyahu. The White House on Saturday didn't immediately answer questions about what would become of Trump's military orders should he be killed.
Fresh Threats and Security Concerns
The Wall Street Journal reported this week that Israel alerted U.S. officials to fresh Iranian plots to kill Trump. The White House refused to comment, but Trump appeared to reference such threats during this week's NATO summit in Turkey, saying, "They want to take out the U.S. leader—me." Sabrina Singh, former Biden administration deputy Pentagon press secretary, said, "Iran wanting to target senior American leaders is something that we know is happening." She added, "You have to take these as credible threats."
Trump was targeted in two domestic assassination attempts during the 2024 presidential campaign and saw a gunman storm the White House Correspondents' Association dinner he was attending in April. The president flew part of the way back to Washington from Turkey this week aboard an older Air Force One jet rather than a new Qatari-gifted aircraft, raising fresh security questions about the newer plane. Images of the jet, which was retrofitted at an estimated cost of $400 million, show it isn't equipped with some of the same missile detection and countermeasure systems as earlier versions.
The swap occurred as the U.S. and Iran once again began trading strikes, jeopardizing last month's initial deal to end the war. Asked about Iranian threats, Trump told reporters aboard Air Force One, "I'm No. 1 on their list."
Legal Questions About Standing Orders
Graff said the U.S. prepared years of plans for how nuclear launch authority would devolve in the event of a surprise attack. That included, during 30 years of the Cold War, keeping fleets of airborne command posts flying 24 hours a day with a general aboard who could take over nuclear launch orders if Washington was lost. "What I believe Trump is saying is that he's left standing orders to attack if he's killed, e.g., that the Pentagon should proceed with standard launch protocols," Graff said. "There's a lot of reason to doubt the legality of such standing orders, since in the event of a president's death, the nuclear launch authority would immediately pass to the vice president or designated successor—and ultimately it would be up to him or her to determine whether to proceed."
Trump's post only refers to firing missiles at Iran, which the U.S. has done scores of times since its war with Iran began. He didn't expressly threaten involving nuclear weapons. Graff said that, in addition to leaving standing orders in case of his death, Trump also might say "something to Vance like, 'If I'm killed, nuke Iran,'" and that would make "more sense and would be absolutely legal."
This isn't the first time Washington has threatened Iran over threats against Trump. Four years ago, the Biden administration warned Iran against attacking U.S. citizens after the Justice Department's disclosure that a member of Iran's Islamic Revolutionary Guard Corps had planned to assassinate John Bolton, Trump's first-term national security adviser. Now a Trump critic, Bolton last month pleaded guilty to illegally retaining classified documents in a case led by Trump's Justice Department.
President Joe Biden's national security adviser Jake Sullivan said in 2022 that "should Iran attack any of our citizens, to include those who continue to serve the United States or those who formerly served, Iran will face severe consequences." Two years later, in the heat of Trump's campaign against Democrat Kamala Harris, Biden's vice president, the Biden administration again quietly warned Iran. This time, officials made clear that an attack on Trump would be considered an act of war.
Why This Matters:
The absence of any constitutional or legal mechanism for automatic military retaliation highlights a fundamental tension in democratic governance: the concentration of war-making power in one person's hands, even after death. If Trump were assassinated, Americans would face not just a national security crisis but a constitutional one—with an untested vice president suddenly holding sole authority to launch devastating strikes that could kill thousands. The threat also underscores the human cost of escalating conflict with Iran, where mourners are openly calling for the U.S. president's death while American military families face the prospect of yet another widening war. Without congressional oversight or public debate, the decision to retaliate would rest entirely with Vance, raising urgent questions about accountability in a system where one person can order attacks affecting millions.