The NRCC hates Jolly and won't give him any support. Since it looks like Hillary will have a turnout operation in Pinellas County and Trump won't, it's hard to see how Jolly overcomes the natural lean of this district against a candidate who, whatever his faults, is popular there.
While the NRCC likely won't give him any support now, if Jolly is still competitive in polling in the fall and it looks like he could win the race, the NRCC will likely have a change of heart and reluctantly support Jolly so they can keep the seat in GOP hands, in my opinion. If Crist is way ahead as the election is closer, however, the NRCC probably won't even waste their time and money.