Not by the presidency.
This is a decision that only the legislature can decide, whether to remove a justice.
“Newt would simply refuse to enforce unconstitutional judicial fiats.”
How is this any different from Obama refusing to enforce immigration laws? If we are arguing that the first duty of the presidency is to uphold the constitution, that means that they have to work within the constitutional framework. They simply can’t ignore rulings they do not like.
That is what Newt is saying so what is the problem?