The House on Friday rejected a resolution authorizing President Obama to continue military intervention in Libya as part of a NATO operation aiding anti-government rebels.
The House voted 295-123 against the continuation of the mission. All but eight Republicans voted against it, along with 70 Democrats.
Lawmakers have grown increasingly angered by the Libya operation and have argued that Obama is required by law to seek congressional authorization. Obama said the operation does not require authorization because of its limited scope.
The House is now debating whether to curtail funding of the operation.