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There have been media questions about the relationship between Labour's candidate for London mayor, Sadiq Khan, and Babar Ahmad, known as the "cyber jihadist", who pleaded guilty in the US to two counts of providing material support to terrorism.

Davis Lewin from the Henry Jackson Society, a foreign policy think tank, along with Labour MP Caroline Flint and Conservative MP Graham Brady, spoke to Jo Coburn on the Daily Politics.

Neither Mr Khan, or one of his team, was available to take part..