Transcript for What to expect from Day 2 of hearings
Let's bring in Jon Karl from the white house as well and, Jon, we saw the president's campaign go after William Taylor and George Kent on Wednesday as sort of unelected bureaucrats. What's their approach towards Marie yovanovitch? Reporter: I expect them to make two points over and over again. They will say you may not like the way she was removed. You may not like what the president said about her but the president has the right to decide who he wants to send over to represent the United States and his administration and the second point is she is entirely -- they will say she is entirely irrelevant to the charges in these impeachment proceedings because she was gone as ambassador in may. That means she was not there when the president had his phone call with president zelensky and she was not there when the president decided to have aid withheld. Mary, the white house has been drawing a line against having any white house officials or members of the office of management and budget which held up the aid to Ukraine go to capitol hill but that appears to be breaking a bit. Reporter: Yeah, George, we are told that mark sandy, an omb official is expected to break ranks and testify here behind closed doors tomorrow. He is a career official and would become the first budget office employee to testify. And he could, of course, shed light on what was causing them to hold up all of that military aid to Ukraine, George. And, Jon, on another front from the courts it now does appear the fight over the president's tax returns could be going to the supreme court and quite soon? Reporter: Yeah, the president's lawyers have asked the supreme court to appeal a decision by lower courts. This is regarding a New York prosecutor's attempt to get eight years of the president's tax returns, the lower courts have sided with New York prosecutors. This case would be heard at the very earliest, George, if the supreme court takes it up in January. It would be precedent setting. The question is whether or not a president can be investigated, can be prosecuted while he is in office. But then, Jon, if the supreme court chooses not to take it up which is not necessarily likely then the president will have to turn over his tax returns? Reporter: Have to turn over his tax returns to New York that does not mean they go public yet, George, but the prosecutors would have that for their case. Jon Karl and Mary Bruce, thanks. You'll join us for today's live coverage with our team starting at 9:00 eastern right here on ABC and ABC news live.
This transcript has been automatically generated and may not be 100% accurate.