NEW YORK — Andrew Yang, a business entrepreneur who recently ran failed campaigns for NYC mayor and the White House, is expected to launch a political party next month to coincide with the release of his latest book, “Forward: Notes on the Future of Our Democracy,” in which he “no longer identifies” as a Democrat.

Crown, the book’s publisher, doesn’t specifically mention any plans for a third political party in its announcement of the book that it calls a “powerful and urgent warning that we must step back from the brink and plot a new way forward for our democracy.”

Yang is set to unveil plans for the new political party around the time of the Oct. 5 book release, as first reported by Politico on Thursday.

Some who work closely with Yang are not pleased, noting they hoped to reform the Democratic Party from within.

“He’s abandoning the coalition he built for an effort that seems simply buzz worthy, at best,” a senior staffer on Yang’s presidential campaign told the Daily News.

It’s unclear what Yang's party might be called or how it might get involved in elections.

Republican mayoral candidate Curtis Sliwa cheered Yang’s move on Friday and warned him to expect flak from Democrats.

“I understand the vitriol directed at those who choose an independent path against the establishment,” said Sliwa, who faces long odds of beating Democratic candidate Eric Adams in the race for City Hall.

A virtual unknown when he launched his 2020 Democratic presidential primary campaign, Yang grew his outsider candidacy by campaigning as a nonpolitician, including embracing universal basic income. He also talked about the workforce challenges of losing millions of jobs to automation and the dark outlook for American jobs and communities.

Yang’s publisher depicts the book as a memoir of a heroic underdog’s quixotic campaign to crack open America’s ossified political status quo.

“Yang’s shoestring 2020 presidential campaign ... jolted the political establishment, growing into a massive, diverse movement,” Crown Publishing Group said in the book announcement.