Theresa May has said she will quit as Conservative leader on 7 June, paving the way for a contest to decide a new prime minister.
In an emotional statement in Downing St, she said she had "done my best" to honour the 2016 EU referendum result.
It would remain a matter of "deep regret" that she had been unable to deliver Brexit, she added.
Mrs May said she will continue to serve as prime minister while a Conservative leadership contest takes place.
She will step down as Tory leader on 7 June and a leadership contest is due to begin the following week.
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She's done a terrible job, but it was a poisoned chalice. I'm not sure if anyone else in parliament could have done a better job, she tried to go for the middle ground in a divided nation and just ended up with frustrating everyone.
Fair play to her she tried what she thought was best and lasted much longer than anyone thought she would do.
Now Boris will come in and solve it all
In an emotional statement in Downing St, she said she had "done my best" to honour the 2016 EU referendum result.
It would remain a matter of "deep regret" that she had been unable to deliver Brexit, she added.
Mrs May said she will continue to serve as prime minister while a Conservative leadership contest takes place.
She will step down as Tory leader on 7 June and a leadership contest is due to begin the following week.
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She's done a terrible job, but it was a poisoned chalice. I'm not sure if anyone else in parliament could have done a better job, she tried to go for the middle ground in a divided nation and just ended up with frustrating everyone.
Fair play to her she tried what she thought was best and lasted much longer than anyone thought she would do.
Now Boris will come in and solve it all