How can Congress override a presidential veto?

Congress can override a presidential veto by achieving a two-thirds majority in both the House of Representatives and the Senate. This process is established by the Constitution, which requires a supermajority threshold to ensure that the decision to counteract a presidential veto reflects a strong consensus among lawmakers.

The rationale behind this requirement is to balance the powers of the executive branch with those of the legislative branch, ensuring that major legislative changes cannot be made lightly and only occur with significant support from elected representatives. By needing a two-thirds majority, Congress demonstrates a united front against the presidential decision, indicating that a substantial portion of both chambers believes the legislation is vital enough to become law despite the President's objections.

The other options do not meet the constitutional requirement for overriding a veto, which is why they would be insufficient in this context.