The forgotten borough must be remembered — as the home of Donald Trump’s presidential library, a city councilman says.

Republican Staten Island Councilman Joe Borelli has written the administration urging it to build Trump’s shrine in the borough, where 57 percent of residents voted for him in 2016 — as opposed to his home borough of Queens or in the city, where “progressive Manhattanites will fight tooth and nail” against it.

“I believe you have a certain affection for our borough and its residents, and I believe that in many ways it is shared,” Borelli wrote in a letter sent to Trump Sept. 20.

Borelli suggested to The Post that the administration team up with the College of Staten Island — where the lawmaker teaches — or consider St. John’s University or Wagner College, where Trump was commencement speaker and received an honorary degree in 2004.

“Plus there is quite a bit of vacant land along our waterfronts,” Borelli told The Post.

Staten Islanders gave Borelli’s pitch mixed reviews.

“It would make a landmark on Staten Island, more people would come to visit,” said 16-year-old Island resident Amber Picone.

Added resident Samantha Terra, 35: “We’re all New Yorkers, here together, we are all Americans doing what’s good for the country. Staten Island is a good place. We have more space than Manhattan or Brooklyn or Queens [and] more locations to sustain a presidential library.”

But borough customs inspector Doug Scha called the proposal a “joke.”

“I don’t want anything to do with Trump,” he said.

The Queens-native president’s relationship with the so-called Borough of Parks can be traced back to his childhood.

As a kid, Trump visited dad Fred Trump’s Grymes Hill Apartments and Tysens Park Apartments complexes, emptying money from laundry machines and doing other odd jobs, according to the Staten Island Advance.

“In the summers I used to work on Staten Island,” the president recalled at fundraiser in the borough last year. “The greatest people. These people are incredible people.”

The Trump Organization sold the apartments in 2004.

Trump has spoken fondly to Borelli about time spent there, Borelli reminded the president in the letter.

The White House wouldn’t comment on Borelli’s pitch.

But in a June interview, Trump suggested housing his presidential archive at one of his properties — and veering south of his hometown.

“I’ve been treated so great in Florida,” he told NBC’s Meet The Press.

Still, Borelli said that: “The law requires [Trump’s] records be maintained, so it will be fun to see heads explode no matter where it gets built.”

Additional reporting by Khristina Narizhnaya