House Democrats on Saturday released the transcripts of closed-door testimony from Jennifer Williams and Tim Morrison (both pdf’s linked below).
The first transcript is from career foreign service officer and Vice President Pence staffer Jennifer Williams.
The House did not need to subpoena Williams who was willing to deliver testimony to the impeachment committee with support from the Vice-President.
Ms. Williams was among the officials actually on the July 25th call between President Trump and Ukrainian President Volodymyr Zelensky. She is also one of the only witnesses who has testified with firsthand knowledge of the exchange.
Testimony of Vice President Pence staffer Jennifer Williamns:
Testimony of National Security Council aide Tim Morrison: