senators, joe manchin and kyrsten sinema, and do so in roughly 48 hours as they press to finalize an agreement to bolster biden's hand and he arrived at the u.n. climate change conference. >> that would be his preference. >> publicly, democratic leaders pressing even in a scaled back form, it's a domestic agenda that would rank among the most transformative in american history. >> we had the new deal era. we had the great society civil rights era. we're on the verge of delivering the build back better era. and we're closer than we have ever been. >> a message also delivered behind the scenes by speaker nancy pelosi to her caucus today, sources say, in the full court press to get democrats behind the plan. it's an agreement that would clear the way to pass biden's $1.2 trillion infrastructure proposal, but white house officials and democratic leaders clear eyed about the scale of the challenge. >> doing big things in congress