American President Lyndon B. Johnson speaks to the nation of "Steps to Limit the War in Vietnam" in a television address. At the conclusion of his speech, he announces: "I shall not seek, and I will not accept, the nomination of my party for another term as your President."

The president of the United States (POTUS) is the head of state and head of government of the United States. The president directs the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces.

Lyndon Baines Johnson, also known as LBJ, was the 36th president of the United States, serving from 1963 to 1969. He became president after the assassination of John F. Kennedy, under whom he had served as the 37th vice president from 1961 to 1963. A Southern Democrat, Johnson previously represented Texas in Congress for over 23 years, first as a U.S. representative from 1937 to 1949, and then as a U.S. senator from 1949 to 1961.

On March 31, 1968, then-incumbent U.S. president Lyndon B. Johnson made a surprise announcement during a televised address to the nation that began around 9 p.m., declaring that he would not seek re-election for another term and was withdrawing from the 1968 United States presidential election. Johnson stated, "I shall not seek, and I will not accept, the nomination of my party for another term as your president."

March 31 is the 90th day of the year in the Gregorian calendar; 275 days remain until the end of the year.