[alloysteel]

Is it even physically POSSIBLE to apply any “gag order” to President Trump?

I do not believe that a Special Counsel can assert that authority, even if the Supreme Court could be somehow coerced into supporting such an action.

Depend on it. President Trump would simply ignore any such admonition.

[Steely Tom]

Basically, if the President can't fire Mueller, then Mueller is the President.

Which is exactly what the Democrats are hoping for.