To the best of my knowledge, USNORTHCOM's primary mandate is control of NORAD - and only in times of extreme duress assistance to State/non military agencies. AFAIK, there was a bunch of legislation that was enacted after Katrina that was just taken off the books again a short while later because it allowed far too much power for the military in enforcing state and municipal law and 'over riding' law enforcement, as it were. Therefore if there was some increase in allocation of troops I don't think it would be for that purpose, but that is speculation at best.
I last read about this stuff back in 2006/20-7ish, but mostly on the websites belonging to the tinfoil hat wearers. Interesting stuff, but I'm skeptical. Where have you been reading this info as of late?
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Any writings in this forum are my personal view and all opinions expressed should be taken as such; there is no implied or direct opinion representative of anything but my own thoughts on various subjects.