Direct quotes from the whistleblower memo:
I have received information from multiple U.S. Government officials that the President of the United States is using the power of his office to solicit interference from a foreign country in the 2020 U.S. election. The interference includes, among other things, pressuring a foreign country to investigate one of the President’s main domestic political rivals. The President’s personal lawyer, Mr. Rudolph Giuliani, is a central figure in this effort. Attorney General Barr appears to be involved as well.
The White House officials who told me this information were deeply disturbed by what had transpired in the phone call. They told me that there was already a ‘discussion ongoing’ with White House lawyers about how to treat the call because of the likelihood, in the officials’ retelling, that they had witnessed the President abuse his office for personal gain. In the days following the phone call, I learned from multiple U.S. officials that senior White House officials had intervened to ‘lock down’ all records of the phone call, especially the official word-for-word transcript of the call that was produced—as is customary—by the White House Situation Room. This set of actions underscored to me that White House officials understood the gravity of what had transpired in the call.
White House officials told me that they were ‘directed’ by White House lawyers to remove the electronic transcript from the computer system in which such transcripts are typically stored for coordination, finalization, and distribution to Cabinet-level officials. Instead, the transcript was loaded into a separate electronic system that is otherwise used to store and handle classified information of an especially sensitive nature. One White House official described this act as an abuse of this electronic system because the call did not contain anything remotely sensitive from a national security perspective.