Could Trump issue an Executive Order declaring all de facto declarations of Martial Law–or at least greatly restricted freedom of motion–illegal, unless ratified by the individual States legislature within 30 days? A simple majority in both houses of their State legislatures would fit the bill. Make the legislators go on record, one way or the other.
Here is the Bill of Rights: https://nccs.net/blogs/americas-founding-documents/bill-of-rights-amendments-1-10
The whole thing would undoubtedly end in court, but the 5th Amendment specifically prohibits anyone being “deprived of life, liberty, or property without due process of law”.
And of course the Amendments passed in the Civil War period grant the Federal Government means of bypassing the 10th Amendment.
Where is the Law in all this? Laws are passed by Legislatures. Governors are empowered to act as de facto Dictators for a period of time, but surely 90 is far, far past that time? And indefinite an insult to and assault on our most basic ideas of Liberty? The point is really indisputable.