on what grounds? seriously. Mere refusal to recuse is not necessarily grounds to impeach and remove. You realize the chief judge would be dragged into this as to why he did not make that happen?
Kagan committed perjury at her confirmation hearing concerning her involvement with Obamacare. That would be reason enough for me.
It would be great, just on general principles, to make an example out of one of the leftist justices. In fact I would remove all four of them if my side had the power to do it. Then let the left howl in protest.