In a speech at the CBI conference in London the Prime Minister said she was "determined" to deliver Brexit, as speculation mounts over whether she will face a leadership challenge.
Speaking to an audience of business leaders, Theresa May said the final stage of Brexit negotiations were "always going to be the toughest", but that a deal was "in view".
"The final stage was always going to be the toughest, but we have in view a deal that will work for the UK, and let no one be in any doubt, I am determined to deliver it," she said.
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Her speech comes after a string of resignations from Ministers over the proposed deal, as well as a flurry no-confidence letters which have been handed in to 1922 Committee chairman, Sir Graham Brady.
A total of 48 letters are required to challenge Ms May's leadership of the Conservative Party, but Sir Graham has remained tight-lipped over the number of letters he has received, revealing to BBC Radio 5 Live that he had not even told his wife the total.
Leadership change won't 'make negotiations easier'
Theresa May leaves 10 Downing Street. Image: Getty
The Prime Minister is due to travel to Brussels this week for talks with EU leaders, and used a televised interview on Sunday to hit out at rivals threatening to unseat her as party leader.
She told Sky's Ridge On Sunday she had not considered quitting, adding: "A change of leadership at this point isn't going to make the negotiations any easier and it isn't going to change the Parliamentary arithmetic.
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"What it will do is bring in a degree of uncertainty. That is uncertainty for people and their jobs.
"What it will do is mean that it is a risk that we delay the negotiations and that is a risk that Brexit gets delayed or frustrated."