what is the minimum number of votes needed to override a presidential veto
Best Answer: There are quorum rules for both House and Senate which require 2/3 of both to be present before business can be conducted. And besides, the Constitution requires 2/3 of the whole membership to override a veto. That means it takes a minimum of 67 Senators to vote to override. The number is fixed at 2/3 the WHOLE membership, not 2/3 of the members present. That's a high threshold to meet. Since 1789 there have been a grand total of 1173 presidential vetoes and only 106 successful overrides.