The MP for Ashfield Gloria de Piero has stepped down from her role as shadow minister for young people & voter voter registration over Jeremy Corbyn's leadership.
She joins former health secretary Heidi Alexander in stepping down.
Toby Perkins, the MP for Chesterfield, has resigned as shadow armed forces minister saying the Labour Party "needs a change at the top".
He said he will stand for leader again if a fresh contest is held amid growing calls for him to stand down within the party.
Labour's deputy leader Tom Watson was enjoying a silent disco at Glastonbury Festival as the party leadership became embroiled in civil war.