So when you, don’t accept that something has happened, the military should stage a coup to set things as you want them to be?
I didn’t answer your question because it is inane and irrelevant to the issue.
Not proposing a coup. I would have the joint chiefs approach the president and present the issue. If the president or the congress after that did not react in accordance with the constitutional question, all of them should resign, as the next level should do and so on until a legitimate answer is provided. Upon resigning I would provide a public statement supporting the junior officers who made the challenge and calling for the president to resign or step up.