We'll find out later whether Boris Johnson or Jeremy Hunt will be the next British Prime Minister.
Voting in the leadership contest closed yesterday evening after a six-week campaign.
It'll either be Boris Johnson or Jeremy Hunt - with Johnson widely expected to get the majority of the vote from Tory party members.
The winner formally takes over from Theresa May tomorrow - who holds her last Cabinet meeting this morning.
Comments from both Johnson and Hunt during the leadership campaign have raised concerns in government circles here about the risks of a no-deal Brexit.
Both men have said they will take the UK out of the EU without a deal if it comes to it.
Taoiseach Leo Varadkar has said he'll look for an early meeting with the new Prime Minister following the election.
It's expected he'll be among the first world leaders on the phone to the new Prime Minister ahead of a crucial few months for Brexit talks.