The Senate approved a sweeping $1.9 trillion coronavirus relief plan on Saturday, putting Congress one step closer to fulfilling an electoral promise from President Biden and his Democratic allies to shepherd a swift, equal recovery to the worst economic crisis since the Great Depression.

With its massive price tag, and major expansion of federal social safety net programs, the package is set to count among one of the largest rescue measures in U.S. history, reflecting Democrats’ pledges to erase disparities that long predate the deadly pandemic.

The bill authorizes $1,400 checks to millions of low- and middle-income Americans, bolsters families by providing new yearly child tax benefits, boosts unemployment payments for workers still out of a job, and invests heavily in the country’s attempt to climb back from a public-health emergency that has devastated families, workers, students and businesses alike.

Senate Democrats adopted the measure entirely on party lines, muscling through a marathon, 25-hour debate that forced them to confront dissent from within the party’s own ranks. The House is set to vote on the Senate’s version of the stimulus on Tuesday, teeing up checks and other financial assistance to start to reach Americans as soon as this month.

“I promised the American people help was on the way,” Biden said Saturday, celebrating the first legislative victory of his administration. “Today, I can say we’ve taken one more giant step of delivering on that promise.”

The Senate passage of the measure, known as the “American Rescue Plan,” provided a fresh burst of positive news for the White House. In recent weeks, the Biden administration has presided over an improving job market — even though there are still 9.5 million more unemployed workers than there were before the pandemic. The country also has witnessed a decline in coronavirus infections and an acceleration in a nationwide effort to vaccinate millions of Americans in need.

But the Senate’s vote illustrated the harsh political realities facing Biden and his ambitious economic agenda. The president’s early pledges for unity and bipartisanship collided with the reality of Capitol Hill, where Democrats opted against scaling back the stimulus significantly in order to attract GOP support. It also foreshadowed the difficulties Democratic leaders may face holding together their disparate caucus of progressive and moderate lawmakers during the even tougher fights on the horizon.