Iran is doing exactly what President Donald Trump warned it not to do — slaughtering political prisoners — even as its rulers try to play rope-a-dope with US negotiators over its nuclear program: So what’s the president going to do about it?

Indeed, per video circulating inside the country, Revolutionary Guard gunmen are marching through hospitals and executing patients in their beds with a shot to the head, even while they are intubated or hooked up to an intravenous drip.

This follows news of summary executions of prisoners swept up in the wake of the January protests: Families report being told that their children had been arrested and were awaiting bail, only to be shown a freshly-murdered corpse dumped outside the prison walls.

Tehran has also imprisoned a Nobel Peace Prize-winning human-rights activist (a seven-year sentence, with more to come) for spreading “propaganda against the Islamic Republic”; the Norwegian Nobel Committee announced Wednesday that Narges Mohammadi has now been beaten nearly to death.

The regime has also arrested a host of major politicians, including Azar Mansouri, the leader of the “reformist” party that helped elect the current Iranian president.

This is the behavior of a ruling cabal desperate to get back in control of the country: Putting tanks and troops in the streets has stalled the mass protests — but they can’t stay deployed forever; will the demonstrations resume once they’re pulled out?

All this makes a mockery of Tehran’s high-level talks with Washington; that “diplomacy” is plainly nothing but a bid to avoid US intervention while the regime attempts to reassert its normal totalitarian control.

Meanwhile, Iran’s spoketrolls bluster about consequences if US forces strike to undermine the regime — a clear sign that Tehran believes America might be able to make a difference, and so erase President Jimmy Carter’s shameful passivity as the murderous mullahs seized power in 1979.

This doesn’t mean mass US bombing is called for, and certainly not American boots on the ground.

But US intelligence ought to be able to identify some blows we can strike to help hasten the disintegration of the Islamic Republic.

Trump urged the brave and noble people of Iran to protest and promised the United States would have their back.

It’s time to make good on those vows: Give this repulsive regime the final shove it needs to collapse.