[Cletus.D.Yokel]

I starting to believe that what must be decided is whether the Executive Branch (individually and collectively) can be held in contempt of the Judicial Branch.

If it can, then there is no separation of powers.
Same goes for ‘contempt of Congress’.
The Executive has no powers to find either Congress or the Judiciary in ‘contempt’.
AAMoF, each of the other 2 branches must look to the Executive branch to enforce a contempt ruling.

[Magnum44]

I think your summation is legally correct, but I’m no lawyer (thank God)

[V_TWIN]

If the judicial branch is allowed to control the Executive Branch in this way we no longer live in a free society.

I think these A-hole activist judges know that full well, it’s just an effort to cripple President Trump’s agenda.

[Publius]

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.