The deputy leader of Wales' biggest council has accused Welsh MPs who resigned from Jeremy Corbyn's frontbench of betraying Labour members.
Labour Cardiff councillor Sue Lent predicted most party members would back Mr Corbyn in a leadership contest.
More than 60 Labour MPs, including 11 from Wales, resigned from Mr Corbyn's team after losing confidence in him.
Ex-shadow minister Angela Eagle is expected to launch a leadership bid after Mr Corbyn refused to stand down.
Another former shadow minister, Pontypridd MP Owen Smith, is also said to be considering putting his hat into the ring.
Ms Lent is one of 16 Welsh councillors who have signed a letter in support of Mr Corbyn.
She said she believed Mr Corbyn would receive the support of 80% of party members in a vote.
"The membership has doubled since last summer, and is increasing more in the last few days with people joining to support him," she said.
"The Welsh MPs who resigned have show a disregard for the membership.
"Back in their constituencies this weekend they will hear a lot of angry people.
"They've betrayed their membership."
Ms Lent added that the MPs had been selected by their local constituency parties and that they should all have to be re-selected as a result of their actions.
The Welsh MPs who quit the frontbench were Mr Smith, Nia Griffith, Chris Bryant, Stephen Kinnock, Kevin Brennan, Wayne David, Susan Elan Jones, Gerald Jones, Christina Rees, Nick Thomas-Symonds and Nick Smith.