Each of those eyeing Downing Street are also trying to make a serious policy pitch in an attempt to sway as many Tory MPs as possible to vote in the first round of the ballot, which will whittle down the list to two candidates who will be put forward for a vote by the wider Conservative Party membership to choose a new leader in the coming weeks.
But his vow to refuse to pay the multi-billion-euro financial settlement she has agreed, covering Britain's liabilities from four decades of European Union membership, drew a sharp rebuke from Paris. He's also promising a tax cut for middle- and high-income earners.
He said: "This extremely serious moment calls for an experienced, serious leader". The rest of the country is just an add-on, the other, lesser bits that don't matter so much. Though an excellent communicator, some doubt he is flashy enough to excite the electorate.
The other candidates are worldwide development minister Rory Stewart, former minister Esther McVey, former leader of the House of Commons Andrea Leadsom and Conservative MP Mark Harper. France 24's Bénédicte Paviot reports from London.
Michael Gove, a British PM hopeful whose prospects have been scarred by recent revelations about past cocaine use, has apparently tried to win back some points with an innuendo-laden jibe at his rival Boris Johnson.More news: Former NFL player Kellen Winslow II found guilty on 3 charges
Environment Secretary Michael Gove, who is battling a scandal over his admission that he took cocaine, jeered at Johnson for shunning the limelight.
Mr Javid's background as the son of Pakistani immigrants sets him apart from numerous other Conservative contenders. A former banker who was elected to Parliament in 2010, he is a champion of the free-market, libertarian wing of the party.
Health Secretary Matt Hancock has pitched himself as the face of a younger, modernising generation in the Conservative Party.
"I wanted to give back to the country that's given me so many opportunities", says Mr Javid, who also introduced his dog in the two-minute clip.More news: Roller Champions has been confirmed, and you can play today
Speaking on BBC Radio Scotland's Good Morning Scotland programme, she said: "At a level of income of £80,000 we've worked out that Scottish taxpayers, providing the income tax system stayed exactly the same next year, they would pay £7,844 more than an equivalent United Kingdom tax payer in combined income tax and NIC next year".
"I have always found it unusual that we have to write the check before there is a deal", says Johnson, in an interview with the Sunday Times. Critics say this is wishful thinking since the bloc will not agree.
Former Work and Pensions Secretary Esther McVey outlined her campaign at a fringe event, saying "we have nothing to fear" from a no-deal Brexit. Because of this the theoretically most senior Conservative to declare support for a leadership candidate came out on Monday for Hunt - the comparatively unknown rising star defence secretary Peny Mordaunt. He's running on a combined ticket of unifying the party and delivering Brexit which has seen him pick up support from across the Leave-Remain divide.
Among the most prominent opponents of Mr Hunt to capture the leadership and hence the Prime Ministership are Brexiteers Boris Johnson and Boris Johnson.
"I'm the Brexiteer that you can rely on", he said. This occurs without a further national election, as the Conservatives presently have the largest number of Members of Parliament, and so form a government.More news: Kohli says apologised to Steve Smith after Indian crowd booing at Oval
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