I'd been wondering if Hegseth was freelancing, volunteering out of the blue when he said on Saturday he was ready to deploy Marines to Los Angeles, the project sounding so off the wall, even more illegal than the National Guard proposal, and I had trouble imagining they'd allow Trump to call him up and ask for them. "Hey Pete! They're burning down Los Angeles! Send the Marines!" And indeed, on the Sunday, Trump didn't seem to have heard of it, suggesting, as he often does when asked about some abuse that he hasn't thought about, that he hadn't made any decisions but definitely could if he felt like it:
When asked what the threshold is for sending in the Marines, Mr. Trump said Sunday: "The bar is what I think it is."
If I'm reading that right, he was saying the only consideration would be the presidential will. When he found out how he felt, what he wanted to happen, that would be the thing that would happen.
Wall Street Journal (gift link) confirms what you probably have been suspecting, that the ICE push over last week in Southern California, where they raided garment factories and warehouses, car washes (nabbing customers as well as workers) and at least one day care center (where they grabbed a mom dropping off her four-year-old), climaxing with Friday's and Saturday's assaults on Home Depot parking lots in Westlake and Paramount, was engineered by Reichskommissar Stephen Miller as part of a general strategic shift away from trying to deport gang members and criminals to deporting any unauthorized immigrants at all.
The somewhat amusing part is that it was motivated by jealousy, of Joe Biden:

