The Republican-led US Senate will vote next week on a targeted $US500 billion ($A700 billion) coronavirus economic aid bill of the type Democrats already have rejected as they hold out for trillions in relief.
With negotiations on a broader package stalled and Election Day approaching, both Republicans and Democrats face pressure to take action to help weather a pandemic that has killed more than 214,000 Americans and damaged the economy.
Congress passed $US3 trillion in coronavirus aid, including help for the unemployed, in the spring.
Both sides say more aid is needed now but appear to remain far apart.
With leaders of the Democratic-run House and Republican Senate still sparring, a bipartisan deal on coronavirus relief remains unlikely before November 3 presidential and congressional elections.
President Donald Trump called off coronavirus relief talks last week only to restart them days later, pushed Congress again on Tuesday to "Go big or go home!!!"
House Speaker Nancy Pelosi took a swipe on Tuesday at Trump's about-face.
"Following his tweet, the stock market went down and so did he in the polls," she said of Trump's assertion last week that there would be no aid package before the election.
In recent days, Pelosi has refused a White House offer for a $US1.8 trillion coronavirus aid package even though it moved closer to her $2.2 trillion proposal - and despite mounting pressure from some members of her own Democratic caucus who would like to see a compromise.
Pelosi angrily defended her stance on Tuesday when a CNN interviewer asked her to respond to a progressive Democrat, Representative Ro Khanna, who had urged her to accept the White House proposal instead of waiting until February next year, when Democrats may also control the Senate and the White House.
"Nobody's waiting till February. I want this very much now because people need help now. But it's no use giving them a false thing just because the president wants to put a check with his name on it in the mail."
Senate Majority Leader Mitch McConnell said the full Senate's first order of business when it returns on Monday would be to vote on a $US500 billion relief bill.
It would include more money for the Paycheck Protection Program, which has helped small businesses pay employees during the pandemic.
McConnell said the bill would include help for schools and liability protections for businesses, which Republicans sought.
He also said there would be more unemployment benefits and assistance for hospitals in the bill.