Just look at how the Lincoln appointees voted in Texas V White.
I’ve got it! We’ll just use force to pack the court. Then when the court rules the way we want, we can say “see??? It was all good and constitutional-like. The court said so.”
Exactly how they passed the 13th, 14th, and 15th amendments. In my opinion, and a known principle in law for centuries, is coercion or duress renders any legal agreement invalid.
According to Law Professor Glenn Reynolds of "Instapundit", this forced ratification of those amendments is much discussed in academic legal circles.