Where precisely in the constitution is the phase "all means necessary" used?
http://www.usconstitution.net/const.html
In the section that says "The congress shall have the power to make war" which has recently been interpreted to mean "The congress shall have the power to authorize the president to use all means necessary"
In case you missed it, we did not declare war on Sept 12, 2001 because our congress is full of cowards.
That said, they did give the president Authorization to use Force which is equivalent and that included "all means necessary" which we all know includes the use of Nukes.