“The act of war is the last option of a democracy, taken when there is a grave threat to our national security.”
What I Didn't Find in Africa (2003)
Context: I was convinced before the war that the threat of weapons of mass destruction in the hands of Saddam Hussein required a vigorous and sustained international response to disarm him. Iraq possessed and had used chemical weapons; it had an active biological weapons program and quite possibly a nuclear research program — all of which were in violation of United Nations resolutions. Having encountered Mr. Hussein and his thugs in the run-up to the Persian Gulf war of 1991, I was only too aware of the dangers he posed.
But were these dangers the same ones the administration told us about? We have to find out. America's foreign policy depends on the sanctity of its information. For this reason, questioning the selective use of intelligence to justify the war in Iraq is neither idle sniping nor "revisionist history," as Mr. Bush has suggested. The act of war is the last option of a democracy, taken when there is a grave threat to our national security. More than 200 American soldiers have lost their lives in Iraq already. We have a duty to ensure that their sacrifice came for the right reasons.
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Joseph C. Wilson 8
American ambassador 1949–2019Related quotes

“We are at war, and our security as a nation depends on winning that war.”
opening statement to 9/11 Commission http://www.cnn.com/2004/ALLPOLITICS/04/08/rice.transcript/, May 19, 2004.

Speech to the Michigan legislature, in Lansing, Michigan (15 May 1952), published in General MacArthur Speeches and Reports 1908-1964 (2000) by Edward T. Imparato, p. 206; part of this was also used in a speech in Boston, as quoted in TIME magazine (6 August 1951) http://www.time.com/time/magazine/article/0,9171,856843,00.html
Context: Talk of imminent threat to our national security through the application of external force is pure nonsense. Our threat is from the insidious forces working from within which have already so drastically altered the character of our free institutions — those institutions we proudly called the American way of life.

Austin, Texas (13 June 1951); as published in General MacArthur Speeches and Reports 1908-1964 https://en.wikiquote.org/wiki/Special:BookSources/1563115891, ed. Edward T. Imparato, Turner Publishing Company (2000), p.175
1950s, Speech to the Texas Legislature

New York Times Op-Ed "Grounding a Pandemic" (6 June 2005) http://www.nytimes.com/2005/06/06/opinion/06obama.html?ex=1275710400&en=69f51e47097d5dd9&ei=5090&partner=rssuserland&emc=rss by Barack Obama and Richard Lugar
2005

1800s, Second Inaugural Address (1805)

2000s, 2002, State of the Union address (January 2002)
Source: NRA-Endorsed Christina Hagan: ‘Stop Sending Our Dollars Overseas,’ Pay Armed Veterans to Protect Schools https://www.breitbart.com/politics/2018/04/24/nra-endorsed-christina-hagan-stop-sending-our-dollars-overseas-pay-armed-veterans-to-protect-schools/ (24 April 2018)

Last words, 10/16/46. Quoted in "Justice at Nuremberg" - Page 506 - by Robert E. Conot - History - 1984

2000s, 2003, Remarks on U.S.-British relations and foreign policy (November 2003)