Now he just has to get Parliament to agree to it.
In the wake of May's not-so-shock resignation, I went to Westminster to see how people felt about her departure from Number 10.
We list the most culpable people and things.
May is currently trying to win support in Parliament for her beleaguered Brexit deal that would avoid the U.K. crashing out of the EU with no agreement in place.
Theresa May addressed the nation yesterday to say that the mess is everyone's fault but hers.
As the clock keeps ticking, there's a hat-trick of Brexit votes in Parliament this week.
Forcing one would be electoral suicide.
She might be bolstered by winning the vote of no confidence, but her authority is still ebbing away.
Could the UK's Conservative Party even hold a leadership election right now?
The PM warned that her removal would be disastrous for the Brexit process.
"There is no room whatsoever for renegotiation.”
We spoke to an etiquette coach and a body language expert to find out what Theresa May is doing wrong.