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Bolton's stated reason ? Concerns about executive privilege.And Bolton was never called during the Senate trial because Senate Democrats couldn't get the 51 votes they needed to authorize witnesses.Now Bolton could have, easily, told his story through some other means. He could have granted an interview with a network to document his interactions with Trump in regard to Ukraine... He chose not to do that.In fact, what we know about Bolton's role in all of this comes from leaks to The New York Times. Here's the key bit :.