Pressed by host David Dimbleby, Corbyn then ruled out using nuclear weapons first in a conflict and refused to be drawn on whether he would be prepared to use them as a retaliatory measure.
"I heard they were coming and I'd seen on the news how great some of his rallies were so I thought I'd come down and check it out", said Mr Jason Guy, 28, an insurance worker who joined Labour a week ago after reading Mr Corbyn's manifesto.
By contrast Mr Corbyn has done better than expected.
There could hardly have been a safer political bet than to call a snap election now when Mrs May was doing so well personally in the polls and when her party was so far ahead of Labour under Jeremy Corbyn.
"They'll get us out, either them or Ukip".
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Her largely ceremonial role becomes pivotal as she must invite either Clark or NDP leader John Horgan to form a new government. The deal means the NDP, with 41 seats from the recent election, and the Greens, with three, will have 44 seats total.
The Labour leader said it was "staggering" that pensioners were not being told at what level the Prime Minister intends to cap social care costs or how many elderly people will face losing the winter fuel payment worth up to £300. It was circulated on Facebook with the caption: "On June 9th, this man could be Prime Minister".
May became prime minister without winning an election in July previous year following the resignation of David Cameron after Britons went against his advice and voted to leave the EU.
"I was involved with UKIP, and for me, UKIP has served its goal, it fought that issue perfectly, and its job is done - the party's over. I had the balls to call an election". "I will decide on the circumstances at the time", Corbyn said.
If that happens, then the supposedly disastrous Mr Corbyn will have outpolled the election performances of his two predecessors - Mr Brown in 2010, who got 29.0% of the vote, and Mr Miliband five years later.
Mrs Thornberry added: "We are fighting to win and we are fighting to win a majority".
Mrs May refused to give a figure for how much she would be willing to pay the European Union in Brexit "divorce" settlement, and she was also challenged over a U-turn on controversial social care plans for England, which saw an as-yet unknown cap added to elderly care costs.
In her session, May was asked why she was not able to provide details of the maximum amount of money people would have to spend on social care, which was only promised after days of backlash against the policy.
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He plays nearly as a sweeper and can see in advance what is going to happen. "We're not favourites, nor are Juventus". We're not going to change anything that we did and we're going to give it our all.
"We've been open about that, and I've also been open that there will be some hard choices to be made in addressing those various challenges".
In another hard moment, she was challenged by a woman who struggled to hold back tears as she described waiting for more than a year for counselling on the state-run National Health Service (NHS).
In another key exchange, Mrs May said she didn't know whether North Korea receives funding from the UK's foreign aid budget.
If the Labour Party fails to win the election, it will not be because the Tories have better policies than Corbyn'sLabour Party, but because of the sabotage created by its own MPs.
In a leisure centre auto park on the outskirts of Reading, 64km from London, more than 1,000 people gathered in the middle of a working day, leaving behind their desk jobs and even climbing trees to catch a glimpse of Mr Corbyn.
But she has been accused of seeking to take advantage of her party's 20-point poll lead over the opposition Labour party - which has now dwindled to the low single figures.
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The United States, Britain and France have been pushing for a new U.N. resolution with tougher sanctions against North Korea . The military is analyzing the object's flight path, South Korea's Joint Chiefs of Staff said in a text message.