Senator Kyrsten Sinema, Democrat of Arizona and another key moderate, also hung back on Wednesday, when her office said she would decide whether to support the proposal based on what was included.
President Biden and congressional Democrats vowed on Wednesday to push through a $3.5 trillion budget blueprint to vastly expand social and environmental programs by extending the reach of education and health care, taxing the rich and tackling the warming of the planet.
The legislation is far from passage, but top Democrats have agreed on working to include several far-reaching details. They include universal prekindergarten for all 3- and 4-year-olds, two years of free community college, clean energy requirements for utilities and lower prescription drug prices. Medicare benefits would be expanded, and green cards would be extended to some undocumented immigrants.
At a closed-door luncheon in the Capitol, Mr. Biden rallied Democrats and the independents aligned with them to embrace the plan, which would require every single one of their votes to move forward over united Republican opposition. But several moderate lawmakers who are crucial to the plan’s success had yet to say whether they would accept the proposal.