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Judge orders Trump to be deposed in $10 billion lawsuit against BBC
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You can only plead the fifth in a civil case if answering could reasonably lead to incrimination. You can't use it to avoid being embarrassed or presenting relevant facts to the case that wouldn't be incriminating. I.e. he can't avoid answering questions about his taxes as long as the tax filings are fully legal and he can't be incriminated.
In a civil case, the jury is fully allowed to take your silence into consideration for adverse interference. As in you answering the question would clearly hurt your case.