As the U.S. Senate continues to debate the possibility of witnesses in the impeachment trial of President Donald Trump Thursday, two prominent experts are making the case that Democrats should allow testimony from former Vice President Joe Biden’s son Hunter Biden in exchange for compelling Trump’s former National Security Adviser John Bolton to speak under oath about what he knows.

American political reporter and author Elizabeth Drew, who covered and published a book about Watergate, wrote in an op-ed for the New York Times Wednesday that Senate Democrats trading Hunter Biden, who sat on the board of Ukrainian energy company Burisma, for Bolton “might well be highly valuable—for the country.”

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