The top two House conservatives on Monday said they cannot vote for their conference’s health care repeal and partial replacement plan in its current form, meaning House GOP leaders have some work to do before they can offer a bill that will get the 218 votes needed to pass the House.

Republican Study Committee Chairman Mark Walker and House Freedom Caucus Chairman Mark Meadows both cited concerns over the plan’s refundable tax credits, saying it amounts to the creation of a new entitlement program. The North Carolina Republicans said that several of their conservative colleagues feel the same way and predicted that the plan could not pass the House in its current form.

No Democrats are expected to join Republicans in voting to repeal the 2010 health care law, so GOP leaders need 218 of their members (out of a current roster of 238 Republicans; soon to be 237 if the Senate confirms Rep. Ryan Zinke as Interior Secretary this week, as expected) to vote for whatever legislation they produce.

Walker said RSC members, who account for roughly two-thirds of the House GOP conference, “would have a tough time” voting for the draft health care plan that was leaked to the press late last week. He said members have not yet been provided with a draft from leadership and that they need more information, specifically what the Medicaid expansion solution would look like long term and how much the refundable tax credits would cost.

“I’m not saying we can’t get there,” he said. “What we don’t want to do is create a fourth column of entitlement when we’re already trying to reform some of the others.”