The President could stop this at any time. All he needs to do is pack the court with more justices to rebalance it. Not doing so makes him complicit.
Exactly how does the president do that? He cannot expand the court on his own. Congress doesn’t have enough Democrats to do it. None of the current justices are going anywhere unless they die.
Everyone chip in to make sure all the conservative justices have free KFC and big macs at all times. While signing up the liberal justices for free gym memberships.