A united Republican bill to repeal and replace Obamacare appears more and more out of reach after an Easter recess full of rowdy town halls, which have emboldened centrist Republicans to oppose an aggressive repeal of Obamacare being pushed by conservative Republicans and the White House.

The key sticking point for Republicans is which Obamacare regulations states would be able to ignore under the final bill. The conservative House Freedom Caucus wants to let states opt out of a health insurance price control called “community rating” and a rule mandating essential health benefits, because they say those provisions lead to higher costs.