Mayor Bill de Blasio is using the suicide of his World War II veteran dad to attract donor dollars for his struggling 2020 campaign.

“Did you see Bill on the Daily Show this week? It’s a must-watch,” says a fundraising pitch that was emailed to potential contributors over the weekend.

“In the interview, Bill talks about his proven commitment to working people — but he also discusses something you may not have heard him talk about before: his father’s suicide,” the email says, referring to his Aug. 14 sit-down with Trevor Noah.

“Bill discussed how it informed his approach to mental health care and overseeing the largest police force in the nation.”

The term-limited pol also deployed the personal tragedy in a department-wide message to NYPD officers last week amid an epidemic of cop suicides.

“There is no feeling worse than wanting to help someone and not knowing how,” de Blasio wrote to police officers, recounting how he lost his decorated Army vet dad when the future mayor was just 18.

De Blasio pledged to cops “help is always here” in the email, even though days earlier, first lady Chirlane McCray’s $1 billion Thrive initiative rescinded its offer to provide counselors for a “mental health first-aid training” seminar.

The move was made, according to City Councilman Joe Borelli, because pro-cop group Blue Lives Matter was a co-sponsor.

The mayor called the allegation a “lie” and accused both The Post and Borelli of “politicizing” the tragic loss of cops and taking a “cheap shot.”

De Blasio first publicly discussed his father’s suicide while exploring a presidential bid in Nevada earlier last year. He also talked about the issue during the first Democratic primary debates in June.

Last weekend marks the first time he’s used the tragedy to fundraise. De Blasio needs to pull in 130,000 donors to make the third debates next month. As of June 30, he’d secured only 6,700 contributors.