Which states?
Virginia, New York, probably Maryland. Not sure what others.
Good question. Let's do some research, shall we?
Hundreds of Trump supporters stormed the U.S. Capitol yesterday, halting the formal electoral college vote count by Congress and creating widespread disorder in the nation’s capital. Though the Department of Defense initially rejected a request from the District of Columbia, on Wednesday afternoon, Acting Secretary of Defense Christopher Miller approved the mobilization of the full D.C. National Guard contingent — 1,100 troops. The governors of Maryland, Virginia and New Jersey also approved activations of their own troops to support the D.C. National Guard, with more states expected to follow suit.
I may be wrong about New York being there, but I don't think so.
The article mentions 1,100. I have heard there are now between 7K and 15K there.