Transcript for Trump suggests he may testify in writing in House impeachment inquiry
The impeachment showdown. Televised hearings first thing in the morning, and this week, nine witnesses. Some of these witnesses were actually listening on that phone call between president trump and the president of Ukraine, and one witness, the ambassador to the eu, Gordon sondland, spoke with president trump about what he wanted in crew crane. It all comes as our new poll shows 70% of Americans believe the president's request to a foreign leader to investigate a political rival is wrong. ABC's Mary Bruce tonight on the new offer from president trump that he might now answer questions in the inkwirry. Skeptics say that's unlikely. Mary's on the hill. Reporter: Tonight, president trump is suggesting he may take the house speaker up on her offer to testify in the impeachment inquiry. The president could come right before the committee and talk, speak all the truth that he wants. Reporter: Pelosi saying trump could even do it in writing. The president's response? "Even though I did nothing wrong, I like the idea and will strongly consider it." But that seems unlikely. Trump is currently blocking over white house officials from testifying and he's attacked those who have. He should not frivolously throw out insults, but that's what he does. I think part of it is his own insecurity as an imposter. Reporter: The president has dismissed the public testimony so far as hearsay, but that changes tomorrow, when congress is set to hear from three officials who were on that call between trump and the Ukrainian president. Jennifer Williams, a special adviser to the vice president, called it "Unusual and inappropriate." And lieutenant colonel Alexander vindman, a top Ukraine expert on the national security council, told investigators, "I did not think it was proper to demand that a foreign government investigate a U.S. Citizen." But the most anticipated witness of the week is Gordon sondland, the trump megadonor turned U.S. Ambassador to the eu. Sondland has already revised his testimony once, admitting he personally told the Ukrainians that if they wanted nearly $400 million of military aid, they would have to publicly commit to investigate the Bidens. Trump has tried to distance himself. Let me just tell you, I hardly know the gentleman. Reporter: Diplomat David Holmes testified he overheard one of their phone calls in a restaurant in kiev. Trump asking whether the Ukrainian president was "Going to do the investigation?" Holmes says, ambassador sondland replied that, "He's going to do it," adding that president zelensky will do "Anything you ask him to." Do you recall having a conversation with sondland on July 26th? I don't recall, no, not at all, not even a little bit. Reporter: Holmes said sondland told him that when it comes to Ukraine, trump only cares about "Big stuff. Big stuff that benefits the president, like the Biden investigation." Tonight, Democrats announced Holmes too will testify in public on Thursday. So, let's get right to Mary Bruce, she's live up on the hill. And Mary, David Holmes, as you just reported there, he'll testify Thursday and we all knoll that's one day after Gordon sonland, and sonland is perhaps the most anticipated witness of this entire inquiry. Reporter: David, sondland has been acting as a middleman. He testified that he told the Ukrainians that military aid was contingent on announcing the investigations. But sondland didn't know these were investigations into the Bidens. He has already revised his testimony once, though. The big question, will he change it again? David? We'll be watching right there with you, Mary, thank you. ABC news will have live coverage, the hearings on Tuesday, Wednesday and Thursday, begins tomorrow morning, 9:00 A.M. Eastern on ABC.
This transcript has been automatically generated and may not be 100% accurate.