Suicide by ‘Sanctuary’?

With the feds saying they’ll pull security funding from “sanctuary cities,” Mayor de Blasio and City Council Speaker Melissa Mark-Viverito have gotten the fight they’ve been spoiling for.

And the NYPD’s caught in the crossfire, with $17.5 million in funding at risk. The Department of Correction could lose $11 million.

Attorney General Jeff Sessions this week said cities that don’t cooperate with Immigration and Customs Enforcement will lose key Justice Department grants.

De Blasio responded Tuesday with fresh orders for cops to block ICE agents from entering city schools unless they have a valid warrant — and call in the lawyers even then.

And no matter that ICE has never targeted schools, and isn’t likely to. But de Blasio banned the feds from Rikers, too.

At her “sanctuary cities” summit, MarkViverito called for these municipalities to become the Trump administration’s “worst nightmare” — presumably by blocking all schoolhouse and jailhouse doors.

The “sanctuary” crowd insists it’s unconstitutional for Washington to withhold aid to coerce cooperation with federal law.

Huh? The feds have long played the same hardball game — to integrate public accommodations, to raise state drinking ages and lower speed limits and so on. Heck, just months ago the Obama team made similar threats in the transgender-bathroom battle.

Government regulations and sanctions are by definition and practice coercive. “Nullification” is a dead-end response.

Weeks ago, we urged compromise on this issue: Until the Trump team actually does something outrageous in enforcing immigration laws, the city shouldn’t be looking to escalate the dispute.

Instead, the mayor and speaker are playing to their political base — the city’s interests be damned.