What's he want it for anyway?
Print off the article that doctor wrote on Avweb about the Payne Stewart accident and how quickly you die at that altitude without o2.
S76 has a point. If he'll do that, he's going to ask you to do something else where getting your license pulled will be the least of your worries.
...and tell him you want a good written reference else you'll report it.
in fact, go ahead and file a NASA report.