I'm not sure if I buy that argument. I understand what they mean, but the US has sovereignty over what happens within its borders. The ICC isn't entering the US and arresting anyone.
By your logic, every other country "impinges on US sovereignty" because they can arrest US citizens within their own borders.
> By your logic, every other country "impinges on US sovereignty"
Trump has claimed exactly that several different times.
They consider their sovereignty to be unlimited. They bomb other countries, starve other countries, sanction other countries...
That's not sovereignty. Sovereignty doesn't imply anything and it is not a designation bestowed by some other entity. It is purely descriptive of an evident state. If you can defend your claim to sovereignty, you are sovereign. Moreover, no claim need be made.