Manchin and Arizona Sen. Kyrsten Sinema have both raised concerns about the bill’s price tag, causing friction in a party that has largely otherwise coalesced around the package.

Manchin, a West Virginia Democrat, poses a large hurdle for Democrats who want to pass the massive $3.5 trillion bill. The legislation faces unanimous opposition from Republicans, meaning Democrats will again be forced to use the budget reconciliation process in an attempt to pass the bill with only a simple majority.

The legislation’s Medicare expansion is among the biggest problem for Manchin, who has argued that the program should be stabilized before expanding it.

“We need to stabilize it,” he told reporters Friday. “By 2026, you understand, the trust fund is going to be insolvent.”

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