Earlier quoted context omitted.
I don't think it's about the numbers at all -- he's seeing whether anybody will stop him from nakedly violating posse comitatus[1]. The President can of course dispatch the military for domestic law enforcement, but to do so he needs to establish a legal exception, like the Insurrection Act. That hasn't happened yet. [1]: https://www.brennancenter.org/our-work/research-reports/poss...
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> Orders for these purposes shall be issued through the governors of the States or, in the case of the District of Columbia, through the commanding general of the National Guard of the District of Columbia.
To surpass that, the president must declare an insurrection. But he’s done no such thing, since such a claim is nakedly indefensible.
(This justification of course only applies to the national guard. The federal armed forces have even stronger guardrails.)