The presenter had to intervene as a guest brought up the former ambassador to the US.
The programme will not broadcast in its usual slot tonight.
BBC Question Time didn't air in its usual Thursday night slot due to the UK local elections this week.
Anyone who has been in a Question Time audience in the past five years is asked not to apply again, to allow new attendees ...
11don MSNOpinion
Question Time has hammered the final nail in its own coffin with latest show of bias
The BBC show has come under fire too many times - there's no way back for it now.
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