Oops my mistake - revised to address @Smokin Joe
As a "commoner" (so are we all), I, alone, can lawfully do nothing other than cast my ballot and hope it gets counted, when it is possible to vote for someone who will work to stem that tide.
My comment was also that we are still in the "pre-vigilante" phase of this, and at some point (not advocating violence nor planning any, personally) people will have seriously have had enough to work together to eliminate the problem where it happens.
No doubt there is serious infiltration of border concerned groups and incitement to do so by federal Agents, and at present their efforts would keep that breaking point in the future because no one wants to be Whitmered.
What smaller and more private events may or may have already occurred is open to speculation, but I have no information that any such acts have occurred, are planned, nor would I, in North Dakota, be likely to participate in such.
If no diplomatic solution is found,
No enforcement solution is found,
at some point, some people will inevitably take the law into their own hands.