likely you'll see repubs sticking w/ him for most if not all of this year, assuming that something truly damning doesnt come out. Then you will begin to see each member making an assessment of how they should support the Pres based on their races. Those in tight races will begin to distance themselves should his approval continue to slide. But again, I dont see that happening for another year. You gotta remember, this is their guy and he's not even 6 months in yet. They will give him a chance to turn it around yet before jumping.