Mr Johnson’s frontrunner status has been repeatedly underlined by the barbed attacks faces from his rivals
Sajid Javid will warn against the Tory Party going for a “comfort zone choice” in selecting its next leader.
Launching his own bid for Downing Street, Mr Javid will aim an apparent jibe at Boris Johnson, who has been publicly endorsed by more than 50 MPs and is the runaway favourite of activists.
Mr Johnson’s frontrunner status has been repeatedly underlined by the barbed attacks faces from his rivals.
Mr Javid will say: “I believe now more than ever that this is a moment for a new kind of leadership and a new kind of leader.
“A leader is not just for Christmas, or just for Brexit, so we can’t risk going with someone who feels like the short-term, comfort zone choice. We need tomorrow’s leader today.”
The Home Secretary also told a Tory leadership hustings on Tuesday that he would ensure a clean break from the European Union if he became Prime Minister.
“We’re the fifth largest economy in the world – we can’t have Brexit in name only, we cannot become rule takers.”
Jeremy Hunt, the Foreign Secretary, argued that he was the candidate who can “get us through this”.
He said: “I have spent my whole life negotiating – and the Brexit negotiations are tough.
“But a good negotiator takes bad choices and turns them into better choices – and having talked to European leaders I know there is a better deal. But we can only do this together.”
The former Brexit Secretary, Dominic Raab, told the hustings he had negotiated successfully at the Council of Europe over prisoner voting and set out his proposals to cut taxes.
But he warned: “If we don’t deliver Brexit, we won’t get on to talk about all those other things we all care about. I want a fairer deal on the economy, to cut tax for the lowest paid.
“My tax cuts: raising the threshold for national insurance, taking a penny off the basic rate of income tax, will save £640 a year for the lowest paid.
‘Rocket boosters to Farage’
The former chief whip Mark Harper said he did not think it was realistic for candidates to commit themselves to leaving the EU on 31 October under all circumstances.
He told reporters afterwards: “I think promising it and failing to do so would put rocket boosters under Nigel Farage and the Brexit Party, whereas what I want to do is destroy the Brexit Party.”
He also said it was “not surprising” he had not received many public endorsements as he was not one of the front runners, but that he was “confident” he would survive the first round of voting.