They’re not pursuing it because the president does have sole legal authority to grant or withhold CBA and if he decides to withhold it and abandon Americans on the ground he can legally do so. Since there’s nothing they can do about it, they decided not to press the point. Furthermore, they don’t care because they figure he’s gone in January anyway and are scared to death to pick on anyone will cry racism.
So they focus on Hillary alone and the dumb video because she’s a future president and she’s white. But it’s looking like the video idea was a WH idea not a Hillary idea...
Sorry, even as lame as the current Congress is they wouldn't have let something this juicy slide by.