The DUmmies' views on martial law have always been as inconsistent as their views on most other subjects, and like most other subjects, depend on the political party that the current president belongs to.
If a Republican is in office, they'll shriek with paranoia that it's just a matter of time before the Repub president declares martial law as a way to increase his own power, and portray it as a Holocaust- level atrocity.
If a Democrat is in office, in contrast, they'll demand a Dem president declare martial law as a heroic and necessary act in order to keep all those mean old conservative citizens in line and punish them for daring to express a conservative thought. Example: in early January of 2017, the DUmmies were demanding that Obama toss out the results of the 2016 election, set a new election date, remain in office past his term limit, and declare martial law to crush any opposition to any of those policies.