Enforcement of a contempt ruling would be done by federal marshals under the control of the Attorney General. The AG could simply refuse to enforce that ruling. The judge would then hold the AG in contempt, and the AG would refuse to enforce that ruling also. That would put the AG in the position of saying that this judge's rulings would no longer be honored. Only impeachment, conviction and removal of the AG would change the situation.
Agreed.
The larger point still stands; Can one ‘branch’ of the government find another ‘branch’ in contempt?
And, ancillary to that, does enforcement matter when one party is ‘in control’ of one or more branches of government?
Add to that, the Judicial Branch is not beholden to any political party. Right?