Bloomberg News reports that Judge Jeremy Cooke intervened after Hayes told prosecutor Mukul Chawla that he would reply to questions 'as I wish'.
'Can you please try and answer the questions and not make speeches', Cooke told Hayes during a second day of cross-examination by Chawla in London.
Hayes, a former trader at UBS and Citigroup, is the first individual to stand trial for rigging the London interbank offered rate. He faces eight counts of fraud, each carrying up to 10 years in prison.
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