The Labour group leader at Lichfield District Council is among 500 councillors to sign an open letter calling on Jeremy Corbyn to resign.
The battle for control of the party has already seen a number of high profile figures – including Labour’s deputy leader Tom Watson – urging him to step down in the wake of the EU referendum.
But now more than 500 councillors have added their voices to the criticism of Mr Corbyn.
Cllr Sue Woodward, leader of the Labour opposition group at Lichfield District Council said that his position had become untenable.
“More than ever, this country needs strong leadership and I’m afraid that Jeremy has not shown this,” she said. “He was not my choice but I have remained loyal, as I have to the 11 others leaders of our party since I first joined.
“As a Labour council group leader myself, if I could not command the confidence of 80% of my groups either at Lichfield District Council or Staffordshire County Council, I would have stood down by now. In fact, if 80% of the groups I lead did not have confidence in me, I would know well beforehand without forcing the issue to this point because I am constantly in touch with them, value their views and listen to them.
“More importantly, though, I know from talking to people here in Burntwood that Labour voters can not support us while he is leader.
“I have had lots of calls and messages supporting my view and have had just two messages saying the opposite – apart from the anonymous ones who just want to hurl abuse or threats.
“It is heartbreaking for me that this is happening at a time when the country desperately needs leadership from their politicians of all colours.”
Cllr Woodward’s Labour colleague at Lichfield District Council, Cllr Diane Evans, is also among the signatories on the letter.