WASHINGTON (AP) — An exhausted Senate narrowly approved a $1.9 trillion COVID-19 relief bill Saturday as President Joe Biden and his Democratic allies notched a victory they called crucial for hoisting the country out of the pandemic and economic doldrums. After laboring all night on a mountain of amendments — nearly all from Republicans and rejected — bleary-eyed senators approved the sprawling package on a 50-49 party-line vote. That sets up final congressional approval by the House next week so lawmakers can whisk it to Biden for his signature. The huge measure — its cost is nearly one-tenth the size of the entire U.S. economy — is Biden’s biggest early priority. It stands as his formula for addressing the deadly virus and a limping economy, twin crises that have afflicted the country for a year. Saturday’s vote was also a crucial political moment for Biden and Democrats, who need nothing short of party unanimity in a 50-50 Senate they run with Vice President Kamala Harris’ tiebreaking vote. They hold a slim 10-vote House edge.