The legendary songwriter has come out of retirement to pen a reworked version of her 1977 track, One, which features a new verse attacking the U.S. leader.
King tells The Guardian the track - her first new music in seven years - "a call to action" ahead of the elections, revealing she reworked the song to perform at a political fundraiser last month, and it went down so well that she decided to release it to "empower people."
The fervent Democrat says, "I need a reason to make music and I haven't had one."
The song, which features her daughters Louise Goffin and Sherry Kondor, includes lyrics aimed at prospective political candidates. "What will we do?/We're gonna run/reach for the sun/come together as one/show 'em how it's done/at the end of the day, we'll be able to say/love won," King sings.
"I see it as empowering people who feel hopeless to do whatever they can as one person. If nothing else, they can vote for Democrats and change the climate of our country."
Last month, Barbra Streisand released her new single "Don't Lie to Me", which also takes aim at Trump.
The accompanying video featured images of the President on the campaign trail and photos of protesters.
Last year (17), folk singer and activist Joan Baez revealed her first new song in 25 years, "Nasty Man", was all about the U.S. leader.
"There's not enough (protest music) right now," she told Rolling Stone. "There needs to be more. It's terribly important."