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Scenario analysis
Status quo
Republicans retain narrow control of both houses of Congress

UBS probability: 10%
Divided Congress
Republicans retain control of the Senate but lose the House

UBS probability: 40%
Democratic sweep
Democrats assume control of both the Senate and the House

UBS probability: 50%
Note: We do not include a fourth scenario of Democrats reclaiming the Senate and Republicans retaining control of the House given the low probability of such an outcome.
Source: UBS, as of 3 October 2026
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