WASHINGTON — Furious American Federation of Teachers members are demanding the union withdraw its endorsement of Hillary Rodham Clinton, calling it premature and undemocratic.

“There was no internal discussion. Zero. Zip,” said Steve Conn, president of the Detroit Federation of Teachers. “This is wrong and something needs to be done.”

The 45-member AFT executive board voted Saturday to back Clinton despite an AFL-CIO request to wait until July when the presidential field is more set.

Critics say union head and longtime Clinton supporter Randi Weingarten secured the early nod to hamper a surge by Clinton rival Bernie Sanders.