If he had a security clearance, then he was personally responsible for the proper handling of all sensitive information, no matter what his boss commanded him to do, except if his boss was the President. Thankfully, Hillary Clinton was not President, and never will be.
Yes and he would have been read-in extensively on the protocols and consequences of violating the laws regarding classified documents and using unsecured communications channels. Part of that would have been his duty to report any violations he was aware of.
“...Hillary Clinton was not President, and never will be.”
Chris Plante says this at least 1x everyday...to his audience’s delight.