WASHINGTON — Defense Secretary Pete Hegseth said Monday the Pentagon will pursue an Iron Dome-style missile defense system for the United States, fulfilling a campaign promise by President Trump.

Walking into the five-sided building for the first time as leader of the American military, Hegseth told reporters they could expect a flurry of executive orders from Trump, 78 — including one that would order the deployment of a system similar to that used by the Jewish state, which blasts missiles out of the sky with an accuracy rate of roughly 90%.

“Today, there are more executive orders coming that we fully support, on removing DEI inside the Pentagon, reinstating troops who were pushed out because of COVID mandates, Iron Dome for America,” he said. “This is happening quickly.”

The Israeli-made air defense system is heralded for its ability to target and shoot down incoming rockets, which has helped limit damage inside Israel from attacks by Iran, Hamas, Hezbollah and the Houthis throughout the 15-month-old Middle East war.

Pursuing an Iron Dome for America was part of the Republican campaign platform in 2024.

“Republicans will ensure our Military is the most modern, lethal and powerful force in the world,” the document said. “We will invest in cutting-edge research and advanced technologies, including an Iron Dome Missile Defense Shield, support our troops with higher pay, and get woke leftwing Democrats fired as soon as possible.”

However, Israel is a small nation — roughly the size of New Jersey — that is located close to its enemies, raising questions about whether the US can actually hope to duplicate Iron Dome’s effectiveness.

Israel’s system is designed to target short-range rockets, rather than the inter-continental ballistic missiles America’s foes like Russia and China would have to fire to reach US territory.

The cost to acquire a system that would cover the airspace of all 50 states is also a potential sticking point.

Raytheon has created a similar system, dubbed the SkyHunter, which it claims “can be produced in the United States to expand availability and capacity for the US and its allies.”

Iron Dome maker Rafael — which is tied to the Israeli government — has told The Post that there are ways in which its system could be adapted to protect a nation the size of America.

A similar system for the US could use a new technology dubbed the “Iron Beam,” which uses directed energy to neutralize ballistic missiles rather than launching defense rockets, Haifa-based company Elbit Systems — which produces lasers for the Iron Beam — told The Post last month at one of its facilities.

Israel has other systems that also work alongside the Iron Dome as part of the country’s renowned air defense — including the Arrow, which operates outside the atmosphere and can intercept long-range missiles, as well as David’s Sling, which was designed to intercept medium-range missiles.

Those systems, due to their capabilities against longer-range projectiles, may also be possible to incorporate in the US.

“From what we’ve seen in the past three decades, since the beginning of when we just thought of the Iron Dome, to today — and from what we see during the war and how our systems have even surprised some of us with what they have been doing and the limits we have reached with them, I can say that [creating an Iron Beam for US needs] is definitely something that I wouldn’t think is impossible,” an Israeli Defense Ministry official told The Post in Tel Aviv at the time.

Mike Huckabee, Trump’s nominee for ambassador to Israel, also told The Post in a November interview he believed Iron Dome could be “scalable” to the size of what would be needed to protect the US.

“With our resources and also knowing where our strategic targets are, we certainly have the capacity to do that,” the former Arkansas governor said.