Although he drank the John McCain Koolaid often, Graham could still be a thorn in the side of Obama and his henchmen.
Graham fought Obama's cuts to the Dept of Defense on several occasions, including the cutting of certain weapons systems and also pay/benefits for our military and veterans.
That's just one example.
Graham is a retired Air Force Colonel in the Reserves.
I am told that all it took for Obama Hussein to call you an enemy was one single incident where you didn't kiss his skinny a$$.
My read on this also. Graham seems to develop a type of devoted loyalty to certain Type A men. Trump could use another loyal supporter in the Senate for sure.