Boris Johnson: 'Don't think anyone could contest a word'
The Mayor of London Boris Johnson has described those who join extremist groups such as Islamic State as men with low self-esteem who are likely to be users of pornography.
He told a newspaper those turning to extremism were unsuccessful with women and described them as losers, among other more colourful terms.
BBC News asked him whether he regretted the language he used.
30 Jan 2015