Making laws
override
Congress enacting a measure over the President's veto, which takes a two-thirds vote in both the House and the Senate.
In full
A returned (vetoed) measure can still become law if two-thirds of each chamber, voting by roll call, insists. Overrides are rare by design: the two-thirds threshold means a President whose party holds even one-third of one chamber can usually make a veto stick.
Also written as: veto override, override of a veto
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.