Boris Johnson will finally appear in public to launch his campaign for the presidency of the conservative party Wednesday, while one of his rivals has questioned the possibility of trusting him to have access to British nuclear codes.

Johnson will want to focus his launch on his Brexit policy, but his character and lack of any control in the contest were attacked Tuesday by rival candidates.

Rory Stewart, an outsider in the leadership race, became the first candidate to personally criticize the former secretary of foreign affairs when he questioned his skills.

Addressing an audience of 600 members of the public, Stewart said, "Do you really feel that it's the person you want to involve in the details of the future of your system?" health and education? Is this the person you want to write for nuclear submarines? Is it the man you want to embody your nation and guide you in the toughest choice we have faced for 50 years? "

He said "trust the Conservative MPs to come up with the right answer".

Two other candidates, Mark Harper and Matt Hancock, also implicitly criticized Johnson's failure so far to submit to scrutiny, with all but Johnson and Jeremy Hunt confirming their desire to participate in televised debates.

Harper, which has about six public supporters among MPs, said all candidates should be open to questions and exams, and that any other route could lead to a similar situation in the 2017 general election when Theresa May's campaign style stumbled.

"If you want to run this country, you have to be ready to exhibit your stand," he said. "I think you have to open up to questions and get ready to be level with people and be questioned about it. We had a general election campaign two years ago and the Prime Minister showed that she was not as good at campaigning as we all thought.

Hancock said, "I certainly think that anyone who is going to run for the position of prime minister should be able to be scrutinized and accountable. Everyone should participate in the proposed televised debates. And I think we have to ask the question, why not? I have nothing to hide and that's why I'm here. "

David Lammy, a Labor MP who supports the People's Vote campaign for a second referendum, blamed Johnson for wanting "Impose a destructive non-agreement on our country, when it does not have the courage to face the people".

A source on the Johnson campaign said that the favorite would answer questions from the media when it was launched and that he was still considering making an offer to the BBC and other television channels for him to participate. to live roundups.

Johnson should be questioned about his confession of having tried cocaine in the past, after his compatriot, Michael Gove, found himself plunged into a controversy over his previous use of the class A drug.

He is also likely to be questioned about how he can reconcile his promise to Brexit supporters that he is willing to abandon May's withdrawal agreement and leave without agreement where appropriate the October 31 with his suggestions to the Soft Breititers that he would try to avoid leaving without agreement.

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