The Prime Minister was at a campaign rally in South London putting forward her case to lead the country after the next General election on June 8.
She quipped: “The alternative [to the Conservatives] should worry us all. Not Just that Jeremy Corbyn has shown time and time again that he’s not up to the task of leadership. if you can’t lead your own party how can you possibly lead the country through this very important moment for us?
“It is not just because the people around him have shown that they are not up to the task of government. I think you’ve given your views on one or two of them already!" she said to laughter from the crowd.
“John McDonnell a marxist who had to Google the deficit and believes in abolishing MI5. And Diane Abbott who can’t add up in charge of our anti-terrorism work and undoing all of the good that we’ve done in relation to immigration over the years. No, those are the alternatives and what this country needs is a strong and stable government."
Earlier, she added: “If I lose just six seats, my Government loses it majority. So that could mean in 10 days time a Government in chaos Jeremy Corbyn in Number 10, McDonnell in the treasury and Diane Abbott in the Home Office and Nicola Sturgeon and the Lib Dems pulling the strings.”
To chants of “no!" and “never never” the crowd made it clear that they were throwing their support behind Mrs May.
She said: "Every vote for me is a vote to stop that from happening.”
Getty/ Sky News
Theresa May slammed Diane Abbott for not "being able to add up" at a campaign stop in London
The prime minister was speaking ahead of tonights head-to-head clash with Labour leader Mr Corbyn where they will face a grilling by a live TV studio audience.
“The battle for Number 10” debate will be broadcast on Sky News and Channel 4 and will be led by Jeremy Paxman and moderated by Sky’s Faisal Islam.
During the speech, Mrs May rolled out her familiar campaign promises on providing a “strong and stable Government” and delivering on Brexit.
“Every vote for me and my local candidates government is a vote for a strong and stable government.”
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Mrs May delivered a scathing attack on Jeremy Corbyn's lack of leadership skills
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Attempting to rally voters behind her, she said that only the Conservatives could deliver what is best for Britain.
She also took the time to pay tribute to the victims of the Manchester bombing attack and said her government planned to “stand up to extremists.”
Britain is still on edge after Salman Abedi killed 22 people and injured 119 more when he detonated a suicide bomb at the Manchester Arena as families left an Ariana Grande concert.
The crowd at the campaign rally shouted never! at the prospect of a Labour government
Mrs May used the opportunity to say that she “would secure the borders” and “make Britain safe”
She said: “What this country needs is a strong and stable government and the leadership to take us forward.”
Adding: “If you don’t want Jeremy Corbyn negotiating Brexit then you need to vote for local Conservatives.”
“I’m offering myself…to get on with Brexit and make a success of it and get the best possible deal for everyone across the county.
She said: “We have the plan…but I need you to deliver me the mandate. I have the plan, the vision…I ask you to give me your backing. And I will deliver for Britain.”