The Pennsylvania State Senate has delayed its vote on a proposed school voucher bill, the Pittsburgh Post-Gazette reports. The bill’s sponsors are attempting to retool it to shore up waning support. Senate Republicans, who’d been caucusing all day, even heard from Governor Tom Corbett, who spoke briefly about his support for the bill.

Opponents of the bill see the delay as a sure sign that the proposed program is in trouble due to concerns over its costs and language. Minority Leader Jay Costa says Republicans are holding up the vote because they don’t want to seem like they’re giving up:

“This legislation is being delayed because they cannot build a consensus around some of the things that they’ve done. They’ve manipulated the bill to try to get votes, but now are not able to get those votes together.”

Initially, the bill would make vouchers available to low-income students and kids from underperforming schools, and then expand eligibility to every student from all income levels over the next four years. According to the Post-Gazette, this provision is very poplar with the voters, as evidenced by an organized rally at the Capital on Tuesday to show support.

The major point of contention is the cost of the plan. While the Republicans are saying that the cost will not exceed $328 million by the third year, the Democrats are countering with a $410 million projected price tag. Democrats are also demanding more transparency in the process that determines which schools are designated as “troubled.” According to Costa, two schools in his district that had never been designated as underperforming were suddenly marked as troubled. “That’s problematic to us,” he added.