In a speech in the West Midlands today, Mrs May slammed labour leader Jeremy Corbyn for being unprepared to lead the UK despite being an MP for 34 years and leader for two.
She said: "He simply is not ready to govern or prepared to lead.
"Not prepared to use nuclear deterrent or take action against terrorists or give police the powers they need to protect us.
"Not prepared to make a single decision for the good of our economy.
"With Brexit negotiations due to begin 11 days after the election he is not prepared for those negotiation.
"But I am prepared. Prepared to take the difficult decision the leadership demands."
Theresa May arrives in the West Midlands for her brexit speech
Theresa May said she would fight for Brexit
Mrs May went on to say that Mr Corbyn’s minders can put him in a suit, but he would still 'go naked into the negotiating chamber'.
Speaking about the leader debates on televsion last night, she said: "Last night showed that Jeremy Corbyn’s minders can put him in a smart blue suit for an interview with Jeremy Paxman but, with his position on Brexit, he will find himself alone and naked in the negotiating chamber of the European Union.
"Now, I know that’s an image that doesn’t bear thinking about, but actually this is very serious"
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Theresa May savaged Jeremy Corbyn for not having a brexit plan
And she accused Jeremy Corbyn of having a “chaotic” approach to Brexit, in contrast to her plans for a "smooth and orderly" EU exit.
She reminded viewers that he called for article 50 to be triggered straight away, which she saus would have been a mistake as it would have meant the government would not have had time to prepare its negotiating strategy.
And she claims that Labour has adopted seven different policies on Brexit, rather than her strong and stable approach.
Theresa May insisted only she was prepared for Brexit talks
The PM also claimed that since she walked into No 10, she decided she wants to “shift the balance of Britain in favour of ordinary working people”. She added: “Since the very moment the British people took that momentous decision, it was clear to me that it was not just a vote to leave the European Union.
“It was also a vote to change the way the country works – and the people for whom it works – forever.
“It was a quiet revolution driven by all those who felt let down and left behind for too long.
“A revolution in which millions of our fellow citizens stood up and said they were not prepared to be ignored anymore.”
And she added that she is full committed “to the case” of Brexit.
Snap election 2017: The pictures politicians may not want you to see Sat, May 27, 2017
Protests, fights and daleks, it's all happening as the politicians hit the campaign trail for the snap election
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Jeremy Corbyn during a visit to Hackney Marshes Football Pitches, to highlight Labour's manifesto commitment to ensure 5% of the Premier League's television rights income is diverted to the grassroots game, during a General Election campaign
The British PM also argued that Brexit is the most important issue facing the UK as the EU exit will impact on every walk of life, from infrastructure to welfare.
She said: If we want to continue to provide a sustainable welfare system, with help targeted at those who need it most – we need to make a success of Brexit.
"If we want to go on investing in transport infrastructure – our roads and bridges and railways – we need to make a success of Brexit.
"If we want to continue to play our part on the world stage, standing up for our liberal values, with strong defences to protect us – we need to make a success of Brexit.
"Everything depends on getting Brexit right."
Theresa May said Corbyn would go 'naked' into Brexit talks
Health too will be affected by the vote to leave, with Mrs May adding: “Our National Health Service – the institution which is there for us at the most difficult times – needs us to make a success of Brexit to ensure we can afford to provide it with the resources it needs for the future.”
And she added that every town and village across the UK needed the government to "make a success of brexit".
Mrs May said: "Everything depends on getting Brexit right. So the central question for this election is who has the will and plan to make a success of Brexit so we can build the prosperous Britain.
"I belive there is only one choice. I am clear about the instructions I have been given.
"While Jeremy Corbyn doesn't have the belief, will and plan – and doesn't have the strength to do so either."
And she vowed to deliver a smooth and orderly Brexit – saying there was no time to waste after the election.
Theresa May vowed to deliver a smooth and orderly brexit
But she also accused the European Union of adopting an “aggressive” negotiating stance ahead of the discussions, which are due to start next month on June 19.
She said: “The European Commission has shown the importance of the choice faced by the British public next week.
“They are adopting an aggressive negotiating position, which can only be met by strong leadership on behalf of Britain.”
Yet despite her "strong and stable" speech, the PM dodged several questions from journalists following her appearance.
She declined to comment on Angela Rayner calling her an “ogre” in brexit talks this morning.
Jeremy Corbyn would not be prepared to be PM, Mrs May said
But she did respond to claims Angela Merkel say she can no longer rely on the UK, saying she plans to continue with Britain’s “deep and special partnership with the EU”.
She added: “We’re leaving the EU but we’re not leaving Europe.
“Last week I was with Angela Merkel at the NATO leaders summit where we showed support for each other to protect our security.
“The next day we were together making a strong statement about our commitment to work together to deal with extremism that can fuel terrorism.”
Theresa May appeared for an interview with Jeremy Paxman last night
Mrs May also declined to comment on whether her “increasingly personal attacks” on Jeremy Cornyn were a sign of desperation.
She said her message had been the same throughout the election campaign – that there could only be one of two people to lead Brexit talks in a choice between her “strong and stable leadership” and a “coalition of chaos”.
Her speech comes as she sought to steer her faltering campaign firmly back to her strong suit of Brexit, attacking "weak" Jeremy Corbyn and horrible Brussels.
A Survation poll for Good Morning Britain today shows Labour continuing to close the gap – up three points since last week on 37 with the Tories unchanged on 43.