Johnson will join a lengthy list of leadership rivals, most of whom have already launched their bids.
He insisted the government must deliver the decision of the British people who voted to leave the European Union, and Britain must leave on October 31, the deadline set by Brussels.
"I am used to people telling me what I can't do", Javid said, adding that he was "uniquely qualified" to safely take Britain out of the European Union on October 31.
"Now is the time to unite this country and unite this society", he said, stressing that this task can be only achieved after leaving the EU.
Labour is to force a vote on whether to take control of the agenda on June 25 to give lawmakers the chance to introduce legislation aimed at preventing May's successor suspending parliament to pursue no-deal.
He warned that failure to deliver on the referendum result would create an "existential threat" for both Labour and the Conservatives.
Referring to his record as mayor of London, he said: "I do what I promise to do as a politician".Читайте также: TV licence fees for over-75s will be means-tested
Johnson plans to tell supporters at a campaign rally Wednesday that "delay means defeat".
Conservative lawmakers will begin whittling down the number of candidates on Thursday, with a round of voting which will eliminate at least one of the 10 leadership hopefuls.
But the measure failed, despite a warning from Conservative MP Oliver Letwin - who broke party ranks - that "if we don't put the fuse out now, we won't be able to disassemble the bomb in September or October".
Labour leader Jeremy Corbyn has said a no-deal Brexit would be "disastrous", telling MPs: "I think some of [the PM's] colleagues need reminding of that".
"I don't think that we will end up with any such thing, but it is only responsible to prepare vigorously and seriously for no-deal".
Also on the programme - a question of gender and sex.
Mr Johnson apologised for "the offence I have caused", but said: "I will continue to speak as directly as I can". "I don't think it will be in our national interest that we drive towards this cliff-edge at speed".При любом использовании материалов сайта и дочерних проектов, гиперссылка на обязательна.
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