Disgraced Rep. Anthony Weiner’s refusal to resign has put the heat on his former mentor, Sen. Charles Schumer.

The top-ranking New York Democrat has been under intense pressure to convince a reluctant Weiner to step down, sources told The Post.

The senior senator has been stewing ever since Weiner accidentally tweeted his crotch shot over the Memorial Day weekend — and fellow Democrats spent all last week urging Schumer to force Weiner out, insiders said.

Weiner had assured longtime ally Schumer the lewd twit-pic was the work of a hacker.

Schumer was “pretty pissed off” when the truth was revealed, said a source with knowledge of the event.

In an e-mail yesterday, Schumer said the scandal left him “heartbroken” — but he stopped short of calling for Weiner to resign.

“For those of us who are longtime friends of Anthony Weiner his wrongful behavior is distressing and saddening,” Schumer said.

“It’s clear he needs professional help and I am glad he is seeking it.”

Weiner was a SUNY senior when he went to work as Schumer’s intern; the then-congressman later gave Weiner his first political job, as an aide.