May's room for maneuver has been eroded by the election drubbing which saw the Conservatives lose their majority in Parliament, and she has kept many ministers in their jobs.
May's new chief of staff will be Gavin Barwell, a former MP who was ousted from his south London constituency as a result of Labour's unexpectedly strong showing in the election.
May's office was forced to backtrack late Saturday after announcing that an outline deal had been agreed with Northern Ireland's Democratic Unionist Party (DUP) to form a government, admitting that talks were still ongoing.
May said Barwell would help her "reflect on the election and why it did not deliver the result I hoped for".
"From hubris to humiliation", said the left-leaning Guardian.
"She does not have personal credibility anymore". But few believe she can hang on for more than a few months.
THURSDAY, JUNE 15 - Bank of England's Mark Carney and finance minister Philip Hammond speak The two men in charge of Britain's economy deliver their annual Mansion House speech on Thursday when they are likely to try to calm businesses and investors anxious by May's precarious grip on power and the uncertain outlook for the United Kingdom economy which has lost a lot of its momentum of 2016.
I think, you know, we see this election extremely effective Labour Party campaign, which has not allowed the Labour Party to win the election outright but has enabled it to deny the conservatives and Prime Minister May a parliamentary majority.
He said his party would seek to vote down May's Queen's Speech, or programme for government, when she presented it to parliament.
Initial talks have begun with Northern Ireland's DUP after Mrs.
While the DUP campaigned to leave the European Union in last year's referendum, it has refused to endorse Mrs May's position that "no deal is better than a bad deal" - insisting that there must be no return of the "hard border" with the Republic.
The strength of any deal looks set to be tested when Westminster meets tomorrow, with Jeremy Corbyn vowing to try to bring down the government and insisting: "I can still be prime minister".
Labour leader Jeremy Corbyn has urged May to resign, but the PM said at her count in Maidenhead that "it would be incumbent on to assure we have that period of stability, and that is exactly what we will do".
Former Treasury chief George Osborne - who was sacked by May past year - called May a "dead woman walking, " and Labor leader Jeremy Corbyn said he was ready to contest another election at any time.
"One of them is country, one of the others is LGBTI rights".
When the snap election was called, polls put Labour more than 20 points behind May's Conservatives.
Meanwhile, speculation is rife about a possible schism within the Tory party which may lead to a leadership contest at a time when conservatives are still recovering from a bruising general election campaign.
The Times of London said in an editorial that "the election appears to have been, among other things, a rejection of the vague but harshly worded prospectus for Brexit for which Mrs". There are also concerns about the party's stance on issues such as climate change, with the manifesto making little mention of any commitment to renewable energy. I wouldn't go that far at this stage, but I think life is going to become very hard for Theresa May and the euro skeptics who want Britain to pull out of the European Union.