If he thinks that Iran will give back the drone he has to be kidding. I don't think that if the US shot down an enemy drone over its territory it would give it back. The only way that the US has any chance of getting back the drone is to call of its dogs of war and to tell Israel to do the same. Otherwise it will be adios to the drone.
IDF fires artillery at two targets in Syria's Golan, military says (Haaretz)
from the article: Obama asks Iran to return downed U.S. surveillance drone