Let's try again, without an inadvertent trip into rule 14 (sorry skuzzy)
Missile Defense - funding has been cut and several programs deployed with a dubious "operational" status or nearing deployment have been either cut or reduced to research programs. In other words, don't count on US ballistic missile defenses...
US nuke response - Our nukes are aging and the program to replace the warheads as their shelf life expires has been cancelled. This means many warheads will inevitably be retired/dismantled and simply not replaced. Also, there has been talk by "the administration" about reducing our nuclear alert posture without requiring threat or competitor nations to return the favor. In other words, don't count on any prompt US nuclear response in the future and you may reasonably expect any country run by crazies (like N. Korea) to completely mis-interpret this as an inability or unwillingness of the US to use nukes for deterrent or WMD response.
Thems are just the facts, nothing to do with politics.