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Asked earlier this week if she would press the button that would kill "hundreds of thousands of men, women and children", Theresa May responded without hesitation: "Yes".
Some people were shocked by May's answer during the debate on Trident renewal. But what would they do if they were put in the same situation?
We took to the streets of London to find out...
More: Theresa May destroyed Jeremy Corbyn at PMQs and now everyone is comparing her to Thatcher