A situation in which the President of Nigeria withholds assent to a bill passed by the National Assembly, and the National Assembly subsequently passes the bill by a two-thirds majority in both chambers, is an example of

Under the Nigerian 1999 Constitution, if the President refuses to assent to a bill, the National Assembly can override the veto by passing the bill with a two-thirds majority in both the Senate and the House of Representatives, after which the bill becomes law without presidential assent. This is a classic example of the legislature checking the executive through a legislative override.