According to an article in the Idaho Statesman:
The latest proposal to replace the Affordable Care Act has become a much harder sell for Republican moderates who will determine whether the bill passes the House of Representatives in a possible vote later this week.
Their main sticking point: concerns about how a new amendment could weaken consumer protections, particularly for people with pre-existing medical conditions.
The proposal would allow states to opt out of the ACA’s “community rating” rule that prohibits individual insurers from charging sick people more for coverage.
In states that receive federal waivers under the proposal, individual insurers could base the cost of coverage on a person’s health status or medical history using a process known as medical underwriting, which was discontinued under Obamacare.