The system where the transcript was allegedly stored is for highly classified information, such as covert operations, and can only be accessed with a code word and has to be approved by a senior White House official with a written record, according to current and former administration officials. The call with Zelensky did not contain classified information, which was why the White House was able to release it this week.
To transfer a call from the normal storage system to the National Security Council's code-word-protected network, a very senior White House official - someone as high as the chief of staff or the national security adviser - must make a formal written request to do so, according to two people who worked with memos of foreign leader calls.
Four former U.S. officials - including aides in previous administrations and the Trump administration - said they were not aware of any calls that did not contain highly classified information being housed in this type of storage system. One former Trump administration official said such calls were sometimes kept on the "high side," only available to aides with high clearances and separate laptops, but not the secure system the whistleblower alleges was used. "Never heard of anything like that," said this official, who was privy to some of Trump's calls with foreign leaders.
There is no evidence that Trump ordered the move. But he has repeatedly fixated on disclosures to the news media, and his aides have spent considerable time trying to limit who hears his interactions with not only foreign leaders but also lawmakers, friends and anyone else Trump consults with.