lines optimistic despite fundamental divisions in the party between them. >> the current draft doesn't do enough to fix the premiums problem. i have so many fundamental problems with the bill it's difficult for me to see how any tinkering is going to satisfy my fundamental and deep concerns. >> reporter: multiple senators voicing concern over this attack ad commissioned by a pro trump super pac against vulnerable republican senator dean heller because he's against the senate bill. >> if you're opposed to this bill we are opposed to you. >> reporter: sources tell cnn heller raised the issue with the president himself after mcconnell reached out to the white house chief of staff, reince priebus calling the ad a stupid move that set the cause back significantly. >> i was amazed and appalled to learn that any republican group would be running negative ads