The race is on to elect the third UK Prime Minister in two months.
Former Chancellor Rishi Sunak could be announced leader of the Conservative Party on Monday after Liz Truss announced she would stand down last week.
But House of Commons leader Penny Mordaunt is also in the running, if she can secure 100 backers to put her on the ballot.
If she's successful, Conservative Members of Parliament will vote on Monday and then Party members could have their say later this week.
Sally Patterson has more in London.
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