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“Vice President Harris, a former prosecutor, will be fundamentally disadvantaged by this format, which will serve to shield Donald Trump from direct exchanges with the Vice President. We suspect this is the primary reason for his campaign’s insistence on muted microphones”
This is to assure Trump doesn’t look weak. The idea is to allow Trump to not answer the question and not allow Harris to call him out on his answers.
https://news.yahoo.com/news/kamala-harris-accuses-donald-trump-092047711.html