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 United States has sanctioned 271 Syrian government employees in response to Bashar Assad's alleged use of chemical weapons.
Weather warning in force across central and northern Scotland until 9am Tuesday morning.
We're all narcissists now (aren't we) so it must be OK for me to see the prism of UK politics through my two stints as a political editor.