Religious groups, as well as House and Senate conservatives, say that by eliminating the credit, the proposal goes against the GOP’s “pro-life” platform.

The House’s chief tax writer has defended the removal of the credit, but it could pose yet another hazard to overcome as the bill moves forward.

“Being pro-life means being pro-adoption. Congress must remember this as we work through the details of tax reform in the coming weeks,” Sen. Ben Sasse (R-Neb.) tweeted Friday.