Inhofe doesn’t want Hagel at all and Graham is demanding answers on Benghazi.
Inhofe and Graham have stated that they will block confirmation of Hagel. There are many others. A fillibuster is a real possibility.
The Republicans do not have enough votes to sustain a filibuster even if they tried it. There are always some Republicans, even some conservatives, who believe the President should get his nominees unless they are convicted felons or something. Hagel is a national joke and an enemy of Israel, but he will be confirmed. Sorry, but it is what it is.