A Labour MP has called for the party to go "back to grassroots" and for this to be "the last election for Keir Starmer".
Bradford East MP Imran Hussain was speaking as his party made "disastrous" losses across the country, as well as in Bradford, where Labour council leader Susan Hinchcliffe lost her seat to Reform UK.
Speaking on the final day of the local election count in Bradford, ahead of the final results being called, Hussain said it was "the worst result in the history of the Labour party".
He said Labour's two years in government had been a "textbook" example of "how to get things wrong".
Hussain, who in 2023 stepped down from Sir Keir's shadow ministerial team over Gaza, blamed the poor results on policies such as cutting the winter fuel payment and scrapping the two-child benefit.
The MP said he also believed Reform UK's wins in the district represented an "open season of hatred against Muslim communities".
"There will be Muslim communities here who will be worried because it looks like we're moving towards the Reform Party," he said.
Newly elected Reform UK councillor Sally Birch said all parties "attracted people for the wrong reasons".
"Some people will try to get into politics and any other job, for example, for the wrong reason and, yes, Reform has had some people who have tried to become candidates for the wrong reasons," she said.
"When we've found it out through vetting, or through other means, those candidates have been blocked from standing. I would say to anyone who might have any fear or trepidation about Reform to come and meet us, come and talk to us."
Anna Dixon, MP for Shipley, said the local losses were part of a national picture and not a verdict on Labour's leadership of Bradford Council.
She did not join calls for Starmer to go.
"I don't think the country would thank us if we rushed and thought the solution was to change the prime minister," she said.
"Reform UK have been plugging into people's anger and dissatisfaction and stirring some of that."
But she said Labour was not bringing about visible change quickly enough.
"We do need to really take this seriously. These are pretty cataclysmic results for us and we do have to understand people's frustrations," she said.
"I am very fearful that while we've turned a corner in Bradford, we've got so much further to go to fulfill our potential and that is now potentially at risk."