Aegis, Patriot, and THAAD are all short-range, terminal phase anti-ballistic-capable systems.
Also, to be clear, it would be a very bad idea for the US to pursue an expansion of the GMD system to be “impermeable” to a peer state, because not only would it be cripplingly expensive (even in the context of US military budgets), but it would also diminish the disincentive of doing a nuclear first strike (which would obviously lead directly to an intercontinental nuclear war), and you can guess who would want to do something like that.
I’m gonna guess that what he’s attempting to refer to here is the Iron Dome system of Israeli fame.
We already have anti-ballistic missile systems:
Also, to be clear, it would be a very bad idea for the US to pursue an expansion of the GMD system to be “impermeable” to a peer state, because not only would it be cripplingly expensive (even in the context of US military budgets), but it would also diminish the disincentive of doing a nuclear first strike (which would obviously lead directly to an intercontinental nuclear war), and you can guess who would want to do something like that.
Joke’s on you, in the time it took you to write out this informed rebuttal he’s already moved on to wet magnets.
Slop 'em up