deal. >> reporter: with its legislative agenda teetering the white house has called in its most powerful weapon, president biden. >> we're in the -- in a pivotal period of our negotiations and discussions. >> reporter: biden hosting a series of meetings with nearly two dozen democratic lawmakers today. first with nancy pelosi and chuk schumer then with groups of warg moderates and progressives, all critical players in the intraparty combat that's broken out. >> he sees his role ad uniting and as working to bring together people over common agreement on a path forward. >> it's a battle that's pushed biden's sweeping dual-pronged $4 trillion domestic agenda to the brink of implosion. the meetings marking the most intensive personal effort deployed by biden, a 36-year senate veteran. today democrats face a legislative pile-up of epic proportions. less than a week from a house vote promised to moderates on