Unified Republican control of the White House and both chambers of the 119th Congress, with narrow majorities in the House, has produced few vetoes while sustaining those issued through consistent party-line voting that falls short of the two-thirds threshold required in each chamber. Recent override attempts on infrastructure and other measures have failed along these lines, reflecting limited legislative confrontation and the historical rarity of successful overrides absent divided government or unusually broad bipartisan coalitions. Traders reflect this consensus in assigning very high probability to no override by year-end. Late-session shifts remain possible only if major bipartisan legislation draws unexpected cross-aisle defections or post-midterm dynamics in a potential lame-duck period alter vote margins.