Corbyn has resisted pressure to quit over what critics say was his lackluster effort to keep Britain inside the EU, saying on Sunday that he would stand again in any leadership election triggered by the party revolt.
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"(I) do not believe the Labour Party under your leadership is, or will ever be, in good enough shape to go to the public in an election and ask to serve them in government," said Anna Turley, the party's spokesperson on civil issues, in her resignation letter posted on twitter.
Turley was joined in her resignation from Corbyn's team by one of the party's foreign affairs team, Diana Johnson, and armed forces spokesperson Toby Perkins.
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An aide to Corbyn's policy team, lawmaker Stephen Kinnock, also said he was resigning from his role. All four will remain elected lawmakers.
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