The Awans were hired *because* they were known to be in the employ of hostile foreign powers.
This, like Benghazi, was no mistake or accident. This has all been about facilitating the turnover of US intel to our enemy.
The Awans were hired during the Bush 2 Administration when Mueller was head of the FBI and Hastert Speaker. Coincidentally, they got on the Congressional payroll not long before the House established actual procedures for stricter background checks of employees.