It’s a straightforward fix, too, even if perhaps politically difficult. “This” is the retention of security clearances by those who leave Federal employ, and the problem that would be fixed by this “this” is this:

The chairman of the President’s Intelligence Advisory Board says he believes crimes were committed by intelligence and law enforcement officials who relentlessly pursued President Donald Trump over the last decade, and he also wants to make sure that spies who abused their powers are stripped of their security clearances and their jobs.

Devin Nunes, the PIAB chairman in question, added this:

I just continue to be fascinated by the people who are still carrying a security clearance. It’s amazing who are still in these agencies. And I’m just shaking my head like every time I turn around, like, wait, wait, wait, wasn’t that person in that position a Russia hoax person.

The fix is this: everyone leaving Federal employ should have his security clearance revoked automatically. Having left the government, that person no longer needs a security clearance; he no longer has any need to know, which is a Critical Item for having a clearance. Persons getting (not just seeking) civilian employment that requires a security clearance should be required to go through an entirely new and current—de novo—security background check. Persons changing jobs within the Federal government should have their clearances suspended pending successful completion of an entirely new and current—also de novo—background check, and any renewed clearance adjusted down (or up) commensurate with the new job.

None of this would prevent those who committed crimes from being prosecuted and, if convicted, jailed. They should be. Nor would any of this prevent the President from firing those who’ve failed to carry out their duty fully and enthusiastically, whether or not they’ve done anything illegal. He should fire them.