Democratic leaders of the U.S. House of Representatives delayed a planned vote on a $1 trillion bipartisan infrastructure bill that had been set for Thursday, bowing to party progressives who had demanded action on a larger social policy bill first.

House Speaker Nancy Pelosi and President Joe Biden have been scrambling to patch up differences between progressive lawmakers, who want a $3.5 trillion social spending package to go along with the infrastructure plan, and moderates wanting a smaller bill.

The move gave Biden and Democratic leaders more time to try to assemble the votes to gain support for a key part of his agenda.