A Downing Street spokesperson said:
The Prime Minister regrets that Baroness Warsi has decided to stand down and is grateful for the excellent work that she has done both as a Minister and in Opposition.
Our policy has always been consistently clear - the situation in Gaza is intolerable and we've urged both sides to agree to an immediate and unconditional ceasefire.
More top news
The father of 'Fast & Furious' star Paul Walker is suing Porsche over his son's death.
Investigating judge in Belgium charges man with murder and participation in the activities of a terrorist organisation: reports
Margaret Rigby spent £57,000 of her friend's money on luxury goods for herself, after gaining power of attorney