Legal Question in Constitutional Law in New York

Re: What is the Definition of Marital Law?

White House counsel provided this explanation of martial law to the president:

As president of the United States, you may persuasively claim to have extensive statutory and constitutional powers to deploy the armed forces of the United States within the boundaries of the United States for law enforcement purposes without recourse to declarations of martial law. The limitations imposed by the Posse Comitatus Act and related statutes are no significant check to your executive powers as Commander-In-Chief to use the armed forces to take such measures as you consider necessary for the public good