Non-compliance. Enforce it with (defensive) violence if necessary.
We need to start thinking along these lines now. Let them start it, but it will be far too late to plan once their first bullet goes whizzing past...
Add up the numbers of elected officials, bureaucrats and government employees. All of them, federal, state, and city. There is millions more of us than there is of them.
There is roughly 1 LEO for every 1000 citizens. Bring over the entire army from two or three foreign countries and add them to ours. The odds are still 500 to 1 in our favor. Those aren’t good odds.
We won’t permit our neighbors to be rounded up like cattle headed for the slaughter house. They can bring on the fight if they feel like committing suicide because that’s what it will be.