There are lies, damned lies — and stuff Mayor Bill de Blasio makes up for national audiences.

In a Hail Mary bid to boost his White House hopes, Hizzoner went on Tucker Carlson’s Fox News show Thursday night. Since the host has taken a strong economic-populist turn of late, the two even bonded for a bit over de Blasio’s latest brainstorm, a “robot tax” that’s supposed to fight the supposed job-killing ills of automation.

Then it got feisty, as Carlson bluntly said what every New Yorker knows, that “the city is dirty. And it’s getting dirtier” now.

The mayor gave everything but an answer, instead switching to bragging that New York is “the safest big city in America” — which it became nearly two decades before he took over.

He also ventured into “alternative facts” to deny Carlson’s charge that he’d endorsed “decriminalizing public urination.” In fact, de Blasio signed the bill that changed public urination from a misdemeanor crime to a mere violation.

Hizzoner’s biggest whopper, however, came near the end, when he piously said, “The Democratic Party for way too long has been way too cozy with donors. I don’t care about what those donors think.”

What? This is a guy who is literally funding his presidential campaign with big-money donations from interests seeking City Hall’s favor — indeed, the Democratic candidate who relies most heavily on large donations.

If sheer audacity was all it took to win, de Blasio would be leading the polls.