Top Democrats said they won’t support a Senate bipartisan infrastructure deal unless there is a guarantee they can pass a massive spending package alongside it that would pay for free college, universal preschool, new healthcare subsidies, green energy initiatives, and other liberal wish list proposals.

Democrats are banking on a “two-step” approach that would pair a narrow infrastructure measure costing roughly $1 trillion with a bill that could cost up to six times as much and would cover what the party describes as “human infrastructure.” The second bill would pass using a budgetary tactic called reconciliation, which allows some legislation to pass the Senate with only 51 votes rather than the usual 60.