(Part-ninjaed by sluissa, whilst writing.)
USAF handles various space-related items already, mostly without the bothersome hand of the Whkte House upon it (just existing appropriations committees, which one hopes default to practical continuity of proven programs), but now there's the opportunity to shift selections of this payload over to Space Command (and make the intended fate of the unconsidered items obvious) for wholesale restructuring...
As an example of the gutting, NASA has seemingly lost CLARREO and PACE (earth observation missions), and the perfectly good NISTAR (due to cost just millions to use, atop the billions already spent to launch the satellite it was already hoisted aboard - a typical Trumpish 'death of a thousand (very very small) cuts' thing to do) and there was originally a proposal to wholesale push NASA's 'home front' stuff onto NOAA (easier to control, it's one of the government agencies shorn of its Obama-era head and still only with an interim replacement, last I heard).
But, instead, the NSC in its Bush (Sr) incarnation was chaired by VOTUS and otherwise populated mainly by Secretary-level direct appointees of the POTUS, and it seems that the Trump revival is following the same pattern.
All in the name of 'Space Security' and implementing Presidential space-policy. Which I frankly (even as someone more under the aegis of ESA's plans) don't have much confidence in. Though don't worry about the Asteroid Redirection Program being scrapped, I'm sure we won't suddenly find that it might have been useful to have a tried and tested platform in place to mobilise in a few months or years, rather than try to cram a decade or so of work into an emergency-led far shorter lead-time.
(Ok, it's not (solely) America's (sole) problem, and not anywhere near a certainty, but imagine if it becomes Trump's anti-legacy that he was responsible for redooming the planet. (Among the various other ways he might be doing that!))