“Drip, drip, drip” — so US District Judge Emmett Sullivan described the constant trickle of disclosures on Hillary Clinton’s email.

“When does it stop?” he demanded.

With the Clintons, it never does. Ever.

It’s not that they invite scandal. They greet it at the door, give it a seat by the fire, beg it to stay for a few more rounds and then crash on the couch — or in the Lincoln Bedroom.

After two presidents who’ve served beyond personal reproach, many Americans have forgotten the eight-year stream of Clinton scandals — right up to the pardons for fat-cat donors in Bill’s final days in the White House. If Hillary wins come November, it’ll all start up again.

Indeed, Judge Sullivan just ensured that she’d take office with at least one investigation still open. He ruled that top State Department officials and Clinton aides can be questioned under oath about whether her private email server was set up specifically to evade the freedom-of-information laws.

Oh, and the FBI’s still doing its criminal probe into Clinton and her cohorts’ mishandling of top-secret information.

Mind you, Judge Sullivan was named to the bench by Bill Clinton — and he made it clear he’s fed up with this stalling. He even left open the possibility of ordering Hillary and Huma Abedin to testify.

“How on Earth can the court conclude there is not at minimum a reasonable suspicion of bad faith?” he asked.

“It just boggles the mind a little that the State Department allowed this practice” — a private email server located in her home — “to occur in the first place. It is very, very troubling.”

We guess the judge has forgotten the ’90s, too: This is just how the Clintons roll.