Perhaps not to an individual, but states and cities sue federal agencies all the time.
IANAL, but I believe it is possible to sue the "entire federal government." When someone commits a federal crime, the paperwork reads "United States vs. {$alleged_miscreant}." So it seems to me that the opposite should also be possible.
IANAL, but I believe it is possible to sue the "entire federal government." When someone commits a federal crime, the paperwork reads "United States vs. {$alleged_miscreant}." So it seems to me that the opposite should also be possible.