The argument I believe is that the leakers who ratted out Flynn have broken the law, so per Nunes et. al. the unethical or illegal behavior of Flynn and the Trump admin should be ignored. At best, it should have stayed secret.........you know so Trump and the GOP could cover it up more easily.
Supposedly Flynn was unmasked improperly and then this info was leaked.
Damn world wide liberal conspiracies making corruption harder and harder.