GOP’s impeachment witness Kurt Volker tosses Giuliani under the bus – and makes a damning update to his testimony
Ambassador Kurt Volker (screengrab)

Ambassador Kurt Volker offered explosive testimony in his opening statement before the House Intelligence Committee.

Volker, the former U.S. special representative for Ukraine negotiations, was a witness requested by House Republicans.

On live television, Volker both threw Rudy Giuliani under the bus -- and poked a major hole in one of the right-wing conspiracy theories about former Vice President Joe Biden.