It's pretty clear the federal troops are there without legal authority or jurisdiction. I wonder what would happen if the mayor and governor ordered the Portland PD and the state police to protect the citizens.
Remember, the protests are explicitly about the local cops. I'd like to believe that some combination of legitimate belief in the job and jurisdictional dick waving would get them to face off with the feds, but I'm not optimistic. And what happens when the mayor orders the police in to restore order and prevent kidnapping and they refuse?
Don't forget, these protests started because it's hard to fire a cop even when you have him on camera killing an unarmed person. I really don't think you could make it stick for blue flu.