What is the best possible way the president of the United States, using besides Kryptonite, only material and technology otherwise available to us in our universe, defend himself against a possible attack by Superman?
My idea was that the president wore a vial in a necklace around his neck that contained a small trace or dart of kryptonite that he or she would wear at all times that would weaken Superman if he came within range of it's radiation, it could also double as a rudimentary firearm and could be triggered to propel a piece of kryptonite into Superman's chest or neck to immobilize him.
In this situation the United States government would stockpile resources of Kryptonite to use a defense weapon against superman.
Another idea would be a heat-seeking hypersonic missile that blew out millions of micro particles of kryptonite when it exploded, like shrapnel.
One person Suggested the use of a CIWS rotary cannon or cannons with Kryptonite Slugs, aka these things 300px-Phalanx_CIWS_test_fire_-_081107-N-5416W-003.jpg
https://en.wikipedia.org/wiki/Phalanx_CIWS
However these defenses would all be irrelevant it seems as Superman could gather more than enough energy from the sun to annihilate any area of Earth the president happened to be on from a distance far enough away from the threat of any kryptonite weapons. And there is simply no material on our Earth that could resist such an attack.