[Idabilly]

“Sure it can. Article I, Section 8, Clause 15: Congress shall have the power to provide for calling forth the Militia to execute the Laws of the Union, suppress Insurrections and repel Invasions.”

That's applicable - If they were in ‘Union’

They were in a new Constitution

[lentulusgracchus]

Also, Article IV applies, in that the State government has to certify insurrection.

The Congress just can't declare a State insurrectionary because they don't like their politics, and order the President to take the Army and the Militia into that State to coerce its People.

This is all discussed in the Federalist as well, in (I think, from memory) Nos. 7 on, passim.

One of the numbers dealt exclusively with the Militia, another with the warmaking powers of the President.

[lentulusgracchus]

I like to use this source for the Federalist:

http://www.constitution.org/fed/federa00.htm

The inclusion of the titles makes it much easier to navigate.

[Non-Sequitur]

That's applicable - If they were in ‘Union’

They were.

They were in a new Constitution.

They were the only ones who thought so. Turns out they were incorrect.