House Speaker Nancy Pelosi (D-Calif.) is staring down a small group of centrist Democrats ahead of key votes this week on the partys agenda.

Nine moderates have threatened to withhold support from a $3.5 trillion budget resolution until the House passes a bipartisan infrastructure bill that the Senate already approved earlier this month.

We can pass the infrastructure measure now, and then quickly consider reconciliation and the policies from climate to health care to universal pre-K that we believe are critical, the centrist Democrats, led by Rep. Josh Gottheimer (D-N.J.), wrote in The Washington Post on Monday .

But Pelosi has said the House wont pass the infrastructure bill before it passes the budget reconciliation bill. She said over the weekend that the House would instead advance the budget, with the goal of passing both the budget and the infrastructure bill before October.

Both bills are potentially major elements in the legacy of Joe Bidens presidency.

The infrastructure bill would plow $500 billion into roads, bridges and broadband, and represents the kind of bipartisan cooperation Biden vowed to deliver. As outlined, the budget would dramatically improve daily life for millions of people by funding universal pre-kindergarten, affordable child care and free community college, plus providing a continuation of child benefits that have already started as part of the American Rescue Plan.