Some people believe that Clinton used her email account to communicate with foreign donors to the Clinton Foundation who subsequently received State Department approvals for deals that they made millions (and even billions) on. If this happened it would clearly be illegal influence peddling (much worse than the influence peddling already revealed in emails we are aware of). So you think we should just tell these foreigners that they need to turn over their emails to us? Under what authority do we ask given that they are not US citizens and not subject to our laws. Honestly, we don't even need to ask the question to know how they would reply.
A much better system would be for all US government officials to do government business on government email (as required by law) so that if questions arise we can verify what was actually communicated by email. If a government official circumvents this system they ought to face appropriate punishment (regardless of their last name).
