People have been chasing ICE out of neighborhoods, banning them from city properties in LA and NYC, building rap sheets to try them once the admin leaves office in Colorado, etc, but fundamentally they're a political problem that can't be solved with violence (without creating much much more violence and harm in the process).

If the USA starts a war with Canada many Americans will see joining Canada as a means of improving their own situation: Canada would likely offer citizenship to enlistees.