[Daralundy]

Does the president actually have the legal ability to remove Governor Blank from power?

[MEG33]

I don't think so, realistically..He could federalize it but states have their rights and last time that was done it was in consultation with the Mayor and Governor..LA Riots

[msnimje]

He can't remove her but I believe the citizens of her state can Recall her.
I do not know if it is part of the The Posse Comitatus Act or not - I do know the Federal Government can take over the government of a state in the case the Government is somehow wiped out under some Emergency act or another.