▶ Watch Video: CBSN Washington — President Biden is speaking Wednesday as Democrats turn their focus to a massive $3.5 trillion tax and spending plan to boost social programs and fight climate change, dubbed the “Build Back Better” agenda. The Senate passed a $1 trillion bipartisan infrastructure bill on Tuesday, with 19 Republicans joining all 50 Democrats to approve $550 billion in new spending on things like roads, bridges, waterways and rural broadband. Senators then held a marathon session to debate a budget resolution that paves the way for the larger package, adopting the measure in a party-line vote of 50-49 early Wednesday morning. The House plans to return to Washington on August 23 to consider the budget resolution, among other things, Majority Leader Steny Hoyer said. Speaker Nancy Pelosi has said the House will not vote on the $1 trillion infrastructure package until the Senate finalizes the $3.5 trillion plan, which could take months. The Senate went into recess after Wednesday’s votes and plans to return September 13. The $3.5 trillion measure serves as the blueprint for Mr. Biden’s social spending agenda, and will include funds to combat climate change, establish child care programs, expand Medicare and provide a pathway to citizenship for undocumented immigrants. Democrats can pass the measure using a process known as budget reconciliation, which would not require the support of any Republicans. How to watch Biden speak on “Build Back Better” agenda What: President Biden delivers remarks on his “Build Back Better” agenda after the Senate passage of a bipartisan infrastructure bill Date: August 11, 2021 Time: 1:15 p.m. Location: White House Online stream: Live on CBSN in the player above and on your mobile or streaming device. Mr. Biden said Tuesday that he expects Democrats to unite behind both plans, despite some disagreements over the price tag and scope of the larger proposal. Senator Joe Manchin, a moderate Democrat from West Virginia who has become arguably the most influential senator in the chamber, voiced concern over the cost of the $3.5 trillion proposal, even as he voted to move forward with the procedural vote early Wednesday. “Early this morning, I voted ‘YES’ on a procedural vote to move forward on the budget reconciliation process because I believe it is important to discuss the fiscal policy future of this country,” Manchin said in a statement. “However, I have serious concerns about the grave consequences facing West Virginians and every American family if Congress decides to spend another $3.5 trillion … Given the current state of the economic recovery, it is simply irresponsible to continue spending at levels more suited to respond to a Great Depression or Great Recession — not an economy that is on the verge of overheating.” Jack Turman contributed to this report.