Senior Democrats in the US Congress are considering backing a huge economic stimulus package to try to steer the country clear of recession.
House speaker Nancy Pelosi suggested a package worth "several hundred billion" dollars was necessary.
President-elect Barack Obama has said he would push for a $175bn (£118bn) stimulus plan but one of his senior aides said much more would be needed.
Mr Obama is due to announce his economic team later on Monday.
Over the weekend, aides said two respected Clinton-era veterans would get key posts.
Timothy Geithner, 47, the head of the Federal Reserve Bank of New York, is to be treasury secretary.
Lawrence Summers, 53, a former treasury secretary in the Bill Clinton White House who has also served as president of Harvard University is to be director of the National Economic Council.
'No blank cheque'
Speaking to CBS News on Sunday, Ms Pelosi said any stimulus package should be aimed at creating jobs immediately, and could contain a tax cut.
"Something of several hundred billion would have to be some investment into the future, plus creating jobs immediately, and a tax cut," she said.
KEY APPOINTMENTS
Another senior Democrat, New York Senator Charles Schumer, told ABC News that a package of between $500bn and $700bn was needed to overcome the current economic crisis.
The president-elect's new economic team will be charged with revitalising the US economy, which is faltering badly amid the global downturn.
On Saturday, Mr Obama said the economy needed to create 2.5m jobs by 2011.
In a weekly address, he said he wanted to rebuild America's ageing infrastructure, including roads and bridges, as well as develop sources of renewable energy.
David Axelrod, the senior campaign strategist who will become a top presidential adviser in the Obama administration, tacitly admitted that the eventual stimulus plan would come in at more than the $175bn pledged during the election campaign.
The president-elect would do "what's necessary", Mr Axelrod told ABC, adding: "I think we're going to have to do a combination of things to get the economy moving again."
Mr Axelrod ruled out a "blank cheque" bail-out of struggling auto manufacturers, who saw their requests for federal funding turned down by the outgoing Congress during the week.
They would be asked to return to Congress in December with a plan, not just "an expression of need", he said.
Experience
Discussing the imminent appointment of Mr Geithner, Mr Axelrod described him as the "right man" for the high-profile job.
"Tim Geithner is someone who had experience in dealing with economic crises as the assistant secretary of treasury for international affairs in the '90s," he said.
"He's intimately involved with the situation now in his role as president of New York Fed [Federal Reserve].
"By temperament and experience, he's the right man to lead the Treasury now," Mr Axelrod added.
Unconfirmed reports naming Mr Geithner first came on Friday, boosting New York shares by 6.5% after days of losses.
Mr Summers is likely to be named as head of the president's National Economic Council, reports have said.
The pair worked together closely at the Treasury during the 1990s, with reports suggesting they have a strong working relationship.
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