The short answer is yes you can.
The long answer is that you have to makes sure the request is not unduly burdensome, which is probably why the DNC is framing their response the way they are.
Here's a good article on the subject:
https://blogs.orrick.com/iplandscape/2014/04/24/be-reasonable-with-non-party-discovery-requests-a-lack-of-diligence-can-cost-you/
So what are the lessons learned? Before filing a motion to compel document production against a subpoenaed non-party, make sure to request documents from the party before moving to compel, and more importantly, perform diligence to ensure you dont already have what youre asking for.
So better buy some popcorn and get ready for the hearing!
So, ask for the stuff nicely first, then subpoena........Good to know...................
Nice work if you can get it.
Since I am pretty sure the DNC does not have real evidence of a “hack” I think if they present any evidence it will be the ODNI “assessment” that Russia interfered in 2006, and related statements from Pompeo, Coats, and Wray saying they believe the Russia nonsense.