Republican majorities in both chambers alongside President Trump create a high bar for overrides, which require two-thirds support in the House and Senate, as demonstrated by the failed attempts in January 2026 on two vetoed bills where Republicans largely sustained the president's position. Unified government has historically produced few successful overrides, though the November 2026 midterms introduce uncertainty over potential shifts in control that could ease or complicate future votes. Traders see a narrow edge for at least one override by year-end due to possible bipartisan measures or post-election dynamics, while sustained party discipline and the infrequency of such votes keep probabilities near even.