2015, Address to the Nation by the President on San Bernardino (December 2015)
“A gun is not an argument.”
Capitalism: The Unknown Ideal (1966)
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Ayn Rand 322
Russian-American novelist and philosopher 1905–1982Related quotes
                                        
                                        On Heath High School shooting where a teenaged gunman killed 3 students at a prayer meeting at the school, on Politically Incorrect (18 December 1997). 
1980s-90s
                                    
“Sometimes you have to pick the gun up to put the Gun down.”
“The quickest way to stop a bad guy with a gun is a good guy with a gun.”
                                        
                                        Excerpt from address given to the National Rifle Association in Dallas, Texas —  https://www.pbs.org/newshour/politics/watch-the-quickest-way-to-stop-a-bad-guy-with-a-gun-is-a-good-guy-with-a-gun-pence-says-at-nra-convention (May 4, 2018) 
Vice President of the United States (2017-Present)
                                    
“Putin must be stopped. And sometimes only guns can stop guns.”
Putin must be stopped. And sometimes only guns can stop guns, 01.02.2015, Timothy Garton Ash, 01.02.2015, The Guardian http://www.theguardian.com/commentisfree/2015/feb/01/putin-stopped-ukraine-military-support-russian-propaganda,
“Out here you better have a gun, and a gun in the wagon ain't good for nothin'.”
                                        
                                        Source: The Quick and the Dead (1973), Ch. 5; the statement here wrongly attributed by a character in the story to a Quaker, who are generally pacifists, is actually one usually attributed to the Puritan, Oliver Cromwell. 
Context: Out here you better have a gun, and a gun in the wagon ain't good for nothin'. I believe what the old Quaker said,"Trust in the Lord, but keep your powder dry."
                                    
                                        
                                         Chapter 9 https://www.marxists.org/reference/archive/mao/works/red-book/ch09.htm, originally published in the Problems of War and Strategy (November 6, 1938), Selected Works, Vol. II, p. 224. 
Quotations from Chairman Mao Zedong (The Little Red Book)