The Iran crisis of the past two weeks isn’t just about nuclear weapons — it’s also an urgent reminder that border security is national security.

Tehran’s terrorist agents are a weapon with a much longer reach than any of the mullahs’ missiles.

They’ve been a threat to Salman Rushdie’s life in the United States and Europe for more than 35 years, and in 2022 an attacker sympathetic to the Iranian government cost the author of “The Satanic Verses” one of his eyes and very nearly his life.

President Donald Trump has been the target of other Iranian plots.

According to court documents, Asif Merchant, a Pakistani man arrested in Texas last year, “indicated an affinity for Iran” when he attempted to hire hitmen to help murder a “political person” believed to be Trump — a scheme thwarted because the associates he sought to recruit were in fact FBI agents.

A second plot involved Farhad Shakeri, an Afghan national now on the lam in Iran.

In November, federal prosecutors in Manhattan charged Shakeri with providing material support for a foreign terrorist organization and planning to kill Trump on behalf of Iran’s Islamic Revolutionary Guard Corps.

Shakeri and two associates also stand accused of concocting a plan to murder “a U.S. citizen of Iranian origin who has publicly opposed the Iranian government,” according to Politico.

Incidents like these don’t receive much media attention not only because they’re unsuccessful but also because they’re not very unusual. It’s not news that Iran is a sponsor of terrorist mayhem and murder.

After American forces bombed three Iranian nuclear-program sites on Saturday, NBC News reported Iran had earlier warned Trump it could activate “sleeper cells” within the U.S. to retaliate against an attack on its facilities.

Rodney Scott, commissioner of Customs and Border Protection, alerted CBP agents to the danger the country now faces because of the porous border policies of the Joe Biden administration:

“Over the past four years, thousands of Iranian (nationals) have been documented entering the United States illegally and countless more were likely in the known and unknown got-a-ways,” he wrote in an agency memo.

Fox News Channel reports more than 1,500 Iranians were apprehended illegally entering via the southern border during the Biden years — and more than 700 of them were released into our country after their arrest.

America has bitter experience of terrorism made possible by weak immigration enforcement.

Five of the 19 hijackers who pulled off the worst terrorist attack in our history on 9/11, 2001, were in the country on expired visas. But the legal immigration status of the other 14 is at least as much of a scandal — was there really nothing that could be done to screen out these terrorists?

Trump’s crackdown on illegal immigration and tightening of border controls and admissions guidelines for foreign students and other legal visitors have outraged liberals, but detecting signs of radicalism before an IRGC or al-Qaeda sympathizer has the opportunity to strike is what’s necessary to prevent another 9/11.