Article I, Section 7, Clause 2 of the US Constitution grants the President the power to veto legislation passed by Congress.

The purpose of a presidential veto is to reject legislation passed by Congress that the President believes is unconstitutional, unwise, or harmful to the nation.

There are two types of presidential vetoes: the regular veto and the pocket veto.

A regular veto occurs when the President rejects a bill passed by Congress and returns it to Congress with a message explaining the reasons for the veto.

A pocket veto occurs when the President neither signs nor vetoes a bill within 10 days (excluding Sundays) after Congress adjourns. In this case, the bill does not become law.

To override a presidential veto, a two-thirds majority vote is required in both the House of Representatives and the Senate.

Presidential vetoes have been overridden less than 10 times in US history, demonstrating the difficulty of overriding a veto.

Franklin D. Roosevelt issued the most vetoes in US history, with a total of 635 vetoes during his four terms in office.

James Monroe issued the fewest vetoes in US history, with only 4 vetoes during his two terms in office.

James Madison went the longest period of time without issuing a veto, with a span of 15 years during his two terms in office.

William Henry Harrison went the shortest period of time without issuing a veto, with only 1 month passing before he issued his first veto.

Grover Cleveland issued the most vetoes in a single year, with a total of 414 vetoes in 1887.

John Tyler issued the fewest vetoes in a single year, with only 1 veto in 1842.

James Madison went the longest period of time without issuing a pocket veto, with a span of 15 years during his two terms in office.

William Henry Harrison went the shortest period of time without issuing a pocket veto, with only 1 month passing before he issued his first pocket veto.