I’m more scared of the commie Status Six autonomous submarine. This monster weapon could detonate an H bomb, wrapped in cobalt off of any port in the United States. This would create a radioactive tsunami that would render a huge area uninhabitable for several hundred years.
Some kind of space based EMP weapon would be a pain in the ass, but it would be as a firecracker compared to what this monster could do.
https://www.usni.org/magazines/proceedings/2020/july/kanyons-reach-rethinking-nuclear-triad-autonomous-age