Per Comey’s standard all federal employees may use their personal phones, computers and home internet connections to conduct any sort of government business, including classified/secret/top secret communications, without penalty.
No, Comey actually said:
"To be clear, this is not to suggest that in similar circumstances, a person who engaged in this activity would face no consequences. To the contrary, those individuals are often subject to security or administrative sanctions. But that is not what we are deciding now."
In other words, a security clearance would be immediately revoked, and the person would likely be terminated for cause.
This is Trump's golden opportunity, if he uses it.
"Comey said:..... Should you trust this person with the nuclear football"?