Vindman says 'no ambiguity' that US ambassador asked Ukraine to investigate Biden

A U.S. national-security adviser told lawmakers leading an impeachment investigation into President Donald Trump there was "no ambiguity" that a U.S. ambassador told Ukrainian officials to investigate former Vice President Joe Biden and his son, according to testimony released on Friday.

"There was no ambiguity, I guess, in my mind. He was calling for something, calling for an investigation that didn't exist into the Bidens," Lt. Col. Alexander Vindman said, referring to Gordon Sondland, the U.S. ambassador to the European Union.

Vindman, who serves on the White House National Security Council, said the U.S.-Ukraine relationship "is damaged" and "will continue to be damaged and undercut."

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