“The Washington Times reported that more than 500 of the 1,000 background checks of Clinton personnel ‘would have prevented the people [involved] from obtaining security clearances at the FBI, Defense Department or CIA.’
Director of National Intelligence Dan Coats testified on Tuesday that government-wide there is a backlog of 700,000 security clearance approvals.”
https://www.washingtontimes.com/news/2018/feb/14/bill-clinton-white-house-had-security-clearance-ba/
The background criterion for security clearances are specified here:
https://sgp.fas.org/othergov/intel/sead-4.pdf
The bloated federal government has problems.