Call it the Arc de Trump.

President Trump posted an architect’s rendering of a huge triumphal arch to mark the nation’s 250th birthday – and his biggest change yet to the capital’s skyline.

The stone arch would be constructed just across the Potomac River from the Lincoln Memorial — soaring above that memorial’s 99-foot height — and add a major new element to DC’s public architecture.

The online sketch depicts a massive monument that bears a strong resemblance to the Washington Square Park arch in Manhattan and the Arc de Triomphe in Paris.

The stone monument features carved wreaths, two huge eagles facing East, and a golden winged angel brandishing a scepter.

The sketch is by architect Nicolas Leo Charbonneau, a partner at Harrison Design whose Sacred Architecture Studio features church designs.

“He’s an extremely talented classical architect,” a source familiar with the project told The Post. “His business is mainly in sacred architecture, but he’s truly a classical architect not just some guy who’s copying and pasting columns.”

The first inkling of Trump’s latest building plans to transform Washington came to light with a small-scale model in the Oval Office. AFP posted images of the design model that was atop the president’s desk Thursday.

Only now is the extent of the preparation for the project coming to the fore, as Trump looks to fill 2026 with celebratory events including a Mixed Martial Arts fight to be hosted at the White House.

The idea for the arch marking the 250th anniversary of the Declaration of Independence came in an article by Catesby Leigh published weeks before Trump took office, according to the source.

The architecture critic called for a temporary arch, and pointed to the structure that marked Washington’s first inauguration, as well as the grandiose tradition dating back to the Romans. 

Information wasn’t available on the cost, the timeline for construction, or who would pay for it. The White House did not immediately respond to a request for comment. 

The arch would go on undeveloped land between the Lincoln Memorial and Arlington National Cemetery inside a grass-covered traffic circle.

On its other side would be Arlington House, the Custis family mansion built as a memorial to George Washington.

It would hardly be the only new mark Trump is putting on the city.

Construction has already begun on a 90,000-square foot structure to house a 25,000-square foot ballroom that connects to the East Wing of the White House.

That structure is set to be larger than the 55,000 square foot executive residence. 

Trump, who sold his towering DC hotel at the end of his first term, has overseen the installation of a pair of 88-foot flag poles north and south of the White House.

And he has gone on a design spree, redecorating the Oval Office and installing a multitude of gold finishings.

He has also brought up new art and artifacts from the White House collection to redesign the Cabinet Room, while installing white paving stones in the Rose Garden.

Other Trump projects include “Garden of Heroes” that Trump has ordered be built, along with new orders intended to maintain a classical stamp on federal buildings and reconsider some of the brutalist ones from the 20th Century.