"The bottom line is this: I gave my word to support the Infrastructure Plan, and that’s what I intend to do," Biden said in a Saturday statement. "I intend to pursue the passage of that plan, which Democrats and Republicans agreed to on Thursday, with vigor."
Adding: "It would be good for the economy, good for our country, good for our people. I fully stand behind it without reservation or hesitation."
The president raised eyebrows this week after he and a group of 21 senators reached a $953 billion compromise to modernize U.S. infrastructure, but then said he would not sign the bill unless Congress also passed a broader Democratic spending package.
Biden has proposed a separate $1.8 trillion plan, titled the American Family Plan, which seeks to heavily invest in "education, health care, child care, and tax cuts for families, coupled with other investments in care for our seniors, housing, and clean energy."
The plan has been referred to as the "human infrastructure" portion of Biden's planned investments across the U.S.
The president told reporters Thursday he wants both packages passed "in tandem."
"If this is the only thing that comes to me, I’m not signing it," Biden told reporters regarding the bipartisan infrastructure deal. "It’s in tandem."
The pronouncement frustrated both Republicans and Democrats on the Hill.
"That statement understandably upset some Republicans, who do not see the two plans as linked; they are hoping to defeat my Families Plan," Biden said in his Saturday statement.
"So to be clear: our bipartisan agreement does not preclude Republicans from attempting to defeat my Families Plan; likewise, they should have no objections to my devoted efforts to pass that Families Plan," he added.
Realizing he had infuriated senators who negotiated the bipartisan deal, Biden spent time making phone calls to members of Congress to keep the plan on track, Politico reported.
After Biden released his Saturday statement, negotiators including Sens. Rob Portman, R-Ohio, and Kyrsten Sinema, D-Ariz., reiterated support for the proposal.
"We should pass it because it is good for the economy and the country," Portman wrote on Twitter.
"Honored to have @POTUS's support," Sinema wrote.
Biden said his commitment to both infrastructure and family assistance should come as no surprise as they were both pledges he made from the campaign trail.
The president also warned members of his own party who have threatened not to sign the bipartisan agreement in protest to items it omitted, telling them "that is a mistake."
Biden said he will work to pass the American Families Plan through a process of reconciliation, which allows Congress to pass spending priorities that reflect a need in the country.
Reconciliation allows for big-ticket items to be approved with a 51-vote majority in the Senate without the worry of a filibuster.
"I will ask Leader Schumer to schedule both the infrastructure plan and the reconciliation bill for action in the Senate," Biden said Saturday. "I expect both to go to the House, where I will work with Speaker Pelosi on the path forward."