WASHINGTON — In an unforgiving display of partisanship, the House passed emergency legislation tonight to avoid an unprecedented government default and the Senate scuttled it less than two hours later.

The final outcome — with the White House and Senate Democrats calling anew for compromise while criticizing Republicans as Tuesday’s deadline drew near — was anything but certain.

“We are almost out of time” for a compromise, warned President Barack Obama as U.S. financial markets trembled at the prospect of economic chaos next week.

Worse case scenario?

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