Pat Glass has resigned as shadow education secretary, just two days after being appointed.
Ms Glass, MP for North West Durham, was made Labour’s shadow education secretary on Monday. She had previously been shadow Europe minister.
But yesterday, she announced that she would not be standing for re-election as an MP at the next general election following death threats against her.
And today, she has said that she is standing down from the shadow cabinet because the situation is "untenable".
Ms Glass’s resignation adds to the pressure on Jeremy Corbyn to resign.
She was joined by Emma Lewell-Buck who said she was "heartbroken at the state of the party" and could no longer continue as shadow local government minister.
The resignations came after Tessa Jowell has issued a direct plea to Jeremy Corbyn to stand down this morning.
The former culture secretary told ITV's Good Morning Britain that the Labour leader was putting the party's future in jeopardy.
Baroness Jowell described the leadership crisis as a "complete shambles" and said it was a "statement of the obvious" that Mr Corbyn must stand down.