At 7:34 a.m. on Sunday, September 20, 2026, Trump announced on Truth Social that the triumphal arch he plans to build at Memorial Circle, beside Arlington Memorial Bridge, would have a second purpose: “At the strong request of the United States Military, and for National Security purposes, I have agreed to convert the magnificent Triumphal Arch... into a top grade Military Complex/Triumphal Arch, to house, store, and have the rapid ability to use large numbers of drones, plus Snipers, on both the roof and plaza areas, and additionally have and hold large quantities of sniper ammunition in storage. There will be no facility like this anywhere in the World.”
Nobody in the government would stand behind the “strong request.” A Pentagon spokesperson told NBC News the department had “nothing additional to provide beyond the post.” AP reported that the Pentagon “said it had no information beyond the president's statement.” The White House declined to elaborate and the Interior Department, which is building the arch through the National Park Service, did not respond. Trump named no threat, no service branch and no official. That the military asked for this is, as of this writing, his claim alone; the Pentagon has neither confirmed nor denied it.
It was also news to the people working on the project. CNN reported that the announcement “caught them by surprise,” citing multiple sources working with the administration on the arch, and that the military function “was not included in the designs” or concepts reviewed by the Commission of Fine Arts or the National Capital Planning Commission. Ed Stierli of the National Parks Conservation Association said the plan “is a completely different one than what the government has presented thus far,” and that “regardless of what is inside of the Arch, it still has to follow the law.” The conservative Washington Examiner noted that “Trump didn't specify whether or how this conversion would change the structure of the arch.”
The timing matters because the arch is in court. Three Vietnam veterans and an architectural historian are suing on the ground that Congress never authorized it, and Judge Tanya Chutkan has ordered the government to give 48 hours' notice before starting work (see A Judge Orders 48 Hours' Notice Before Work on Trump's Arch, and the Federal Preservation Review Ends Without Agreement). Their lawyer, Nicolas Sansone of Public Citizen Litigation Group, said, “The President's belated efforts to manufacture a national security justification for this project do nothing to cure its fundamental illegality.” Rep. Don Beyer (D-Va.), whose district borders the site, wrote, “Trump clearly expects to lose a lawsuit and therefore wants to set up a pretext to argue that the arch is tied to national security,” and called “a drone launching site directly in the landing path for DCA” a “stupid, dangerous, and unworkable idea.” That the post is a litigation pretext is their reading, not an established fact.
There is a precedent for the reading. CNN noted that Trump “began messaging the ballroom as a national security necessity in late February, only after the project began facing legal challenges,” and that in August the Park Service quietly began calling the arch's planned observation deck a “military observation deck.” Mark Cancian, a retired Marine colonel at the Center for Strategic and International Studies, told Reuters of the new military function, “It looks like it's tacked on in order to strengthen the rationale for construction.” He pointed out that Joint Base Myer-Henderson Hall is about a mile away: “There is this military facility long established with a variety of military capabilities one mile away. So why you need this one isn't clear.”
What exists so far is a social media post. No revised design, filing or budget reflecting a military use has surfaced. Final approval from the National Capital Planning Commission is still pending, and on September 18 the FAA found the structure would not be a hazard to aircraft on condition that it carry an “eternal flame” beacon. The only public funding figure remains CBS News's April report that the National Endowment for the Humanities reserved $2 million plus $13 million in matching funds. Trump's post also claimed the arch had been “planned since the Civil War Era” and that Washington is the only one of “59 top cities and Capitals” without one; he offered no support for either (see To Build His 250-Foot Arch, Trump's Interior Department Argues a 1910 Law Capping Washington's Buildings Never Applied to Federal Ones).
Update (September 22, 2026): the military framing drew pushback from a senior House appropriator in Trump's party. Asked on September 21 whether Pentagon funds should pay for the arch, Rep. Mike Simpson (R-Idaho) said, according to Politico as reported by The Hill, “If it was my choice, I wouldn't put any of that money into the arch,” adding, “there's a lot of things that we need the military funding for, in fact, we're short on military funding right now.” He said he hoped that if the administration goes ahead, “they would come to Congress and ask for an appropriation for it if they're going to use appropriated dollars to do it.” No administration request for arch funding, military or otherwise, has been made public.
Update (October 1, 2026): The officials responsible for the arch say they have not seen the military plan. The Washington Post reported on September 29 that administration officials “were unaware of specific plans to convert” the arch into a military complex, more than a week after Trump's post. According to the Post's reporting as summarized by The New Republic, officials with the Advisory Council on Historic Preservation and the National Park Service said they would proceed with the existing designs, had not heard from the Defense Department, and plan to open the monument to tourists. The Independent reported that council officials told advocacy groups the administration had submitted no plans matching the president's description. Rebecca Miller, executive director of the D.C. Preservation League, wrote that if the military plans go forward, “a new or supplemental review would be required.”
In the Senate, Jeff Merkley, the top Democrat on the appropriations subcommittee that funds the parks, sought on September 28 to pass a bill barring federal money for planning or building the arch and preventing the demolition of monuments without congressional approval. Republican Sen. Mike Lee blocked it, The Independent reported. “The Trump Arch is a monumentally bad idea, and it is abundantly clear there is no authorization from Congress for this massive arch,” Merkley said. The preservation council separately ended its Section 106 consultation on the project in late September (see A Judge Orders 48 Hours' Notice Before Work on Trump's Arch, and the Federal Preservation Review Ends Without Agreement).