Technically correct under normal circumstances.
However, there is this to take note of:
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Did this mean that martial law could never be implemented? No, the Court
said.
The President can declare martial law when circumstances warrant it:
When the civil authority cannot operate,
then martial law is not only
constitutional, but would be necessary: “If, in foreign invasion or civil war,
the courts are actually closed, and it is impossible to administer criminal
justice according to law, then, on the theatre of active military operations,
where war really prevails, there is a necessity to furnish a substitute for the
civil authority, thus overthrown, to preserve the safety of the army and
society; and as no power is left but the military, it is allowed to govern by
martial rule until the laws can have their free course. As necessity creates
the rule, so it limits its duration; for, if this government is continued after
the courts are reinstated, it is a gross usurpation of power. Martial rule can
never exist where the courts are open, and in the proper and unobstructed
exercise of their jurisdiction. It is also confined to the locality of actual
war.”