Eastleigh by-election: John O'Farrell Thatcher comments
17 February 2013 Last updated at 12:34 GMT
The Labour candidate in the Eastleigh by-election previously claimed he was "disappointed" Margaret Thatcher was not murdered by the IRA and that he wanted Britain to lose the Falklands War.
The shadow justice secretary said John O'Farrell's comments in a book were "probably bad humour, him trying to be funny, but clearly not funny".
Sadiq Khan told Andrew Neil they were written 20 years ago, and added: "Some of it is in bad taste and should not have been said, but he was writing a book that was at the time, very funny, very witty."
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