TBH, that was the failure of both the Bush and Obama admins.
The Bush admin had access to all their emails from their own private server, so they didn't bother ensuring a modern tech stack was available for their successor.
And data host for a crapload of congressional committees and govt agencies too.
"What? Emails? Private server? You said it was NBD! Unfair!"
Here. You can read more about that operation in relation to MS and GWB43's WH for free.
When HRC was found out, she fessed up and took responsibility, even when the encryption wasn't implemented to spec...
and actively allowing the data that was breached to be wielded against them, preventing them from taking action against Trump.
Don't say 'it doesn't matter that she used a private server...'
Say "The Bush admin should have ensured a modern tech stack was ready for the new admin to use rather than using their own; she used a secure off-site host while waiting for that to catch up.
Unless you want to have to do the same thing when it comes out that the GOP was doing the same, except theirs was actually breached by hostile foreign actors and used to blackmail the USG into submission.
ask them right back about the 2015 breach of their emails, if Karl Rove et al passed any restricted information, if any classified info linked to the contract for DIA Solicitation #0012005 could have been cached + exfiltrated.