WASHINGTON—The House was expected to pass later Friday a sprawling $3 trillion coronavirus relief bill largely along party lines, but lingering tension among Democrats injected some drama into the proceedings.

The proposal marks the Democrats’ starting point for talks with Republicans and the White House on the next round of stimulus, and sets the stage for dueling political messages in an election year. Democrats say more spending is needed to prop up businesses and households on top of the $3 trillion approved so far. Many…

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