After former National Security Adviser John Bolton announced Monday that he would be willing to testify in a Senate impeachment trial against President Donald Trump, Sen. Bernie Sanders demanded the president answer one question:

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Link to tweet

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"President Trump claims he is innocent of all charges, that he did nothing wrong, and that he never withheld military aid to Ukraine in exchange for political favors," the Vermont Independent senator said. "If you are not guilty of corruption and abuse of power, you should welcome the testimony of your former national security advisor and other witnesses."

Sanders's challenge to the president came on the heels of statements by his Democratic colleagues, who said Bolton's willingness to testify made it clear that Senate Majority Leader Mitch McConnell (R-Ky.)—who indicated last month that he was reticent to call witnesses for an impeachment trial—must subpoena Bolton and other witnesses.

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https://www.commondreams.org/news/2020/01/06/bolton-willing-testify-senate-sanders-ask-trump-what-are-you-afraid