Former US special envoy to Ukraine Kurt Volker said Tuesday he failed to realize that an investigation into the Ukrainian energy company Burisma Holdings was linked to a probe of President Donald Trump's political rival, former Vice President Joe Biden, which Volker now says was"unacceptable."
Volker testified as part of the House impeachment inquiry that, unlike his prior closed-door testimony, he's now aware of conversations others had linking a White House meeting and US security aid with the Ukrainian President announcing an investigation into the Bidens.
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