It really all started with the Clintons in the 90’s. The book “Unlimited Access” by Gary Aldrich, the FBI agent in the White House in charge of security clearances and vetting discusses first hand how they ignored, flaunted, and deliberately mishandled security at all levels, and the floodgates opened from there.
I have a copy of that book. Mr. Aldrich wrote a personal message to me in it. He said he heard I was a "true patriot." It's one of my prized possessions.
The Hillbilly Whorehopper and the Arkansas Medusa had people in the White House who were ineligible for security clearances.