Former US envoy to Ukraine Kurt Volker’s testimony Tuesday in the House impeachment inquiry differed markedly from his October deposition, as the veteran diplomat said he had learned new details since then.

“Since I gave my testimony on Oct. 3, a great deal of additional information and perspectives have come to light. I have learned many things that I did not know at the time of the events in question,” Volker said in his opening statement.

“I did not know of any linkage between the hold on security assistance and Ukraine pursuing investigations. No one had ever said that to me — and I never conveyed such a linkage to the Ukrainians.”

Volker also said that he now knows that the investigation Trump wanted Ukraine to launch into Burisma — the Ukrainian gas giant that hired Hunter Biden as a board member in 2014 — was intended as an investigation into Joe Biden and his son.

“In retrospect, I should have seen that connection differently, and had I done so, I would have raised my own objections,” added Volker, who was called as a witness by the committee’s Republicans.

Volker also said in October that investigations were not discussed during a July 10 White House meeting with EU Ambassador Gordon Sondland and aides to Ukraine President Volodymyr Zelensky.

But on Tuesday, he said that Sondland did bring up investigations, and that he found it “inappropriate.”

Sondland also changed his testimony earlier this month from what he had said during his deposition, claiming he remembered that $391 million in security aid Trump was withholding was linked to the probes he wanted.

“I now recall speaking individually with [Zelensky aid] Mr. [Andriy] Yermak, where I said resumption of US aid would likely not occur until Ukraine provided the public anti-corruption statement that we had been discussing for many weeks,” Sondland said in his amended testimony.