Suppose there is open conflict between an executive administration and the federal judicial branch. The executive branch wants to curtail judicial power, but is hopefully limited by the Constitution in what it can do. Presumably there is also a certain precedence and decorum that discourages such conflicts from escalating. That said, were such a situation to escalate, would the executive have actions they could take that would weaken the judiciary? Likewise, does the judiciary have any proactive defenses against such measures?
My understanding is that Article III judges are fairly well protected from retaliation by their lifetime appointment. Rude remarks aside, are there actions that could, in practice, weaken their powers or imperil their jobs?