The Constitution does not defend itself. Someone with standing will have to mount a challenge, if the can, from possibly somewhere deep inside the American gulag.
So, ask yourselves this: If the government begins to spirit Americans away to inter them in the bowels of the government's penal system or just to a FEMA camp, ostensibly to rot, have they raised the ante to where armed resistance is now justified?
The government will not spirit people away and lock them up somewhere in this country. That would be too dangerous. The government has secret prisons in foreign countries where loyalty is bought on the cheap. A favorite place is Romania with gypsy prison guards. Other favorites are Morocco and Algeria. They have local Berbers available who are renowned for cruelty and lack of loyalty to any nation.
In fact, during the junta of the Marxist Lincoln we find that he arrested and deported a sitting US Congressman from Ohio, Clement Vallandigham, for speaking out against that tyrant's unconstitutional war.