Watch Bill spend

Mayor de Blasio plays a dangerous game with New York City’s increasingly fragile budget, mistaking threats from his Washington nemeses to deeply slash aid for a political mandate to spend, spend, spend like there’s no tomorrow. His proposed budget released Wednesday hikes planned spending to a record $85 billion for the year that begins in July — up 3.4% over last year’s plan and up a too-far 5% in city taxpayer funds pledged, more than twice inflation.

This is the doing of a politician drunk on the elixir of his reelection campaign and national ambitions, putting city taxpayers on the hook for his compulsion to solve all social ills.

Since de Blasio’s first budget draft in January, which promised declines in some spending, agencies managed to find $733 million in new musthave items, including $177 million more for homeless services, with shelter and service outlays projected to reach an astounding $1.75 billion this year.

The mayor commits to tens of millions more to expand pre-K to more 3-year-olds, hire lawyers for immigrants and tenants, grapple with the opioid crisis and aid domestic violence victims, atop new education and child welfare mandates from the state and City Council.

Subtract key tax revenues on the decline. Raise an eyebrow at savings claimed, from health care premiums and bond interest rates to a cap on color photocopying. And worry, really worry, about havoc the federal budget and proposed tax reforms will wreak on $7 billion received annually.

What, he worry? Denying what the numbers say in black and red, the mayor blames “an ideological current that believes we should shrink the size of government.”

City Council Speaker Melissa Mark-Viverito and Finance Chair Julissa Ferreras-Copeland cheer on the mayor’s spending spree and demand more. They peddle principled resistance to looming federal budget cuts with scarcely a shred of credibility.