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
Some of the children at the Royal Free Hospital in London were less than impressed with their visit from Alex Oxlade-Chamberlain.
How closely have you been paying attention to the news this week? Test your memory with our Friday quiz.
The FBI said three key elements of the Sony Pictures cyber attack led them to identify the administration in Pyongyang as the culprits.