President George W Bush has said that legislators will “rise to the occasion” and pass the proposed $700bn (£380bn) Wall Street rescue plan.
He said disagreements remained as “the proposal is big and the reason it’s big is because it’s a big problem”.
Senate Majority Leader Harry Reid, a Democrat, said lawmakers would stay in session until a deal was reached.
But rebel Republicans remain unhappy at the plan to buy mortgage-backed assets from US banks.
However there were some positive signs later on Friday, when Democratic House of Representatives Speaker Nancy Pelosi said progress was being made on a financial rescue bill.
She said Congress was “back on track” in its efforts, and that lawmakers would continue to work over the weekend to reach agreement.
And Barney Frank, Massachusetts Democrat Representative and chairman of the House Financial Committee, said: “I am convinced that by Sunday we will have an agreement that people will understand on this, on this Bill”.
Speaking earlier in the day Mr Bush said were “disagreements over aspects of a rescue plan but there is no disagreement that something substantial must be done”.
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