London Bridge attacker 'was known to authorities'

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As a vigil is held for the dead and injured police name two of the three men behind Saturday's terrorist attack in London. We ask what we know about the men, and what may have motivated them. Plus we have an extended discussion with senior politicians on the implications of Saturday's attack; foreign policy as an issue in the general election; and Britain's place in the post-Brexit world with Tobias Ellwood, Emily Thornberry and Nick Clegg. Picture: People attend a vigil at Potters Field Park, in central London Credit: REUTERS/Marko Djurica.