This seems to be another do-or-die week for the AHCA. The Republicans offered an amendment to the original draft of the ACHA that was meant to placate more hard line conservatives, but it very well may wind up pushing more moderate Republicans away.
The amendment, drafted by Rep. Tom MacArthur, would allow states to waive certain Obamacare regulations and come up with their own. This could lead to insurance companies being able to do away with the pre-existing condition requirement, which is a pillar to the current law.
It's not clear whether the Republicans have the votes in the House, but even if they do pass this amended version then it will go to the Senate where passage is less than guaranteed.