“A memory hole is any mechanism for the deliberate alteration or disappearance of inconvenient or embarrassing documents, photographs, transcripts or other records, such as from a website or other archive, particularly as part of an attempt to give the impression that something never happened. The concept was first popularized by George Orwell’s 1949 dystopian novel Nineteen Eighty-Four, where the Party’s Ministry of Truth systematically re-created all potentially embarrassing historical documents, in effect, re-writing all of history to match the often-changing state propaganda. These changes were complete and undetectable.” https://en.wikipedia.org/wiki/Memory_hole
The Department of Homeland Security’s chief watchdog scrapped its investigative team’s effort to collect agency phones to try to recover deleted Secret Service texts this year, according to four people with knowledge of the decision and internal records reviewed by The Washington Post. https://www.washingtonpost.com/national-security/2022/07/29/homeland-inspector-general-texts/
DHS Inspector General Joseph V. Cuffari wrote a letter to the House and Senate Homeland Security committees this month saying the Secret Service’s text messages from the time of the attack had been “erased.” But he did not immediately disclose that his office first discovered that deletion in December and failed to alert lawmakers or examine the phones. Nor did he alert Congress that other text messages were missing, including those of the two top Trump appointees running the Department of Homeland Security during the final days of the administration.
Eideard 
“A memory hole is any mechanism for the deliberate alteration or disappearance of inconvenient or embarrassing documents, photographs, transcripts or other records, such as from a website or other archive, particularly as part of an attempt to give the impression that something never happened. The concept was first popularized by George Orwell’s 1949 dystopian novel Nineteen Eighty-Four, where the Party’s Ministry of Truth systematically re-created all potentially embarrassing historical documents, in effect, re-writing all of history to match the often-changing state propaganda. These changes were complete and undetectable.” https://en.wikipedia.org/wiki/Memory_hole
“How Donald Trump Contaminated the Secret Service” https://www.thedailybeast.com/how-donald-trump-contaminated-the-secret-service By Jeffrey Robinson, co-author of “Standing Next to History: An Agent’s Life Inside the Secret Service”
The Department of Homeland Security’s chief watchdog scrapped its investigative team’s effort to collect agency phones to try to recover deleted Secret Service texts this year, according to four people with knowledge of the decision and internal records reviewed by The Washington Post. https://www.washingtonpost.com/national-security/2022/07/29/homeland-inspector-general-texts/
DHS Inspector General Joseph V. Cuffari wrote a letter to the House and Senate Homeland Security committees this month saying the Secret Service’s text messages from the time of the attack had been “erased.” But he did not immediately disclose that his office first discovered that deletion in December and failed to alert lawmakers or examine the phones. Nor did he alert Congress that other text messages were missing, including those of the two top Trump appointees running the Department of Homeland Security during the final days of the administration.