The impasse boosts the odds against passing stimulus-checks legislation before Congress adjourns Sunday.
Some Senate Republicans are reluctant to boost stimulus payments beyond $600.
A giant year-end spending bill combines $900 billion in Covid relief aid with a bevy of business tax breaks.
Still, Republicans and Democrats are closer than ever to agreeing on a price tag for a stimulus measure.
Neither Republican nor Democratic leadership has signed on to the plan.
The move dampens hopes that additional stimulus will be passed before Inauguration Day.
Extended unemployment benefits and pandemic jobless benefits for gig workers are set to expire at the end of the year.
House Speaker Nancy Pelosi said that a smaller bill “doesn’t appeal to me at all.”
Senate Republicans remain the stimulus's ultimate road block.
As the deadline nears, both sides still appear far from a deal.