Ten Conservative MPs are vying to replace Theresa May as Britain's next Prime Minister, spruiking their positions on everything from tax policy to past drug use and, of course, Brexit.
Key points:
* Nine men and one woman have so far nominated themselves
* Former London mayor Boris Johnson is the favourite to replace Theresa May
* Sam Gyimah was in the race, but pulled out after nominations closed
He says he will take Britain out of the EU bloc without a deal if necessary, and on Monday promised a tax cut for millions of middle and high-income Britons.
Unlike the other candidates, Mr Johnson has not given television interviews or held any public events, as his campaign team tries to avoid gaffes that could spoil his frontrunner status.
The process of selecting a leader is a lengthy one: the candidates will first be announced by party officials, and there will then be a series of voting rounds where the candidate with the least amount of support is eliminated.
When the final two candidates remain, a postal vote is held with the full party membership across the country — about 160,000 people — and the winner is announced on the week of July 22.
"The leadership I offer is based on one simple truth; without Brexit there will be no Conservative Government and maybe no Conservative Party," Foreign Secretary Jeremy Hunt said as he officially launched his campaign on Monday.
Mr Hunt backed the losing "remain" side during the 2016 EU membership referendum, but now says he will negotiate a better Brexit deal with the EU and lead the UK out of the bloc.
Former Brexit Secretary Dominic Raab is competing with Mr Johnson for the support of hardcore Brexiteers.
He said on Monday that Britain had "suffered a loss of nerve" and must not delay its departure from the EU beyond the October 31 deadline.
He has even suggested he could suspend parliament if it tried to delay or impede Brexit.
Health Secretary Matt Hancock has pitched himself as the face of a younger, modernising generation in the Conservative Party.
Promising to deliver an energising blend of social liberalism and economic dynamism, he said on Monday that the Conservatives had to look beyond Brexit — a message that may be coming too soon for many in the party.
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