Several Republican senators doubted their tax reform legislation would raise the deficit enough to trigger $25 billion in mandatory cuts to Medicare next year, despite a new estimate that it would.

A major concern from centrist holdout Sen. Susan Collins, R-Maine, is that the bill would trigger a 2010 law that installs mandatory spending cuts if the deficit reaches a certain threshold. Collins said she recently received assurances from Senate Majority Leader Mitch McConnell that he would pursue a waiver to the 2010 law’s deep cuts.