May's future, which she herself had curtailed by offering to resign to get her deal through parliament, was hanging by a thread after she softened her position on a second Brexit referendum and customs arrangements with the European Union.
The calls for her resignation further deepened Britain's Brexit crisis. Almost three years since Britain voted to leave the EU and just under two months after the scheduled departure, it is not clear when, how or even if Brexit will happen.
(With inputs from Reuters)
May will remain as prime minister while her successor is elected in a two-stage process under which two final candidates face a ballot of 125,000 Conservative Party members, the report said.