History suggests the opposite. The only attempt was a democrat one.
https://www.weblinenews.com/wp-content/uploads/2016/02/supre...
Anyone who thinks the SC shall be a beacon of impartiality doesn't understand that government is inherently political, the SC notwithstanding. Each Justice will sit on the bench with a particular lens. In that sense, the SC is most just when each Justice sees the world a bit differently with a distortion towards the legal documents themselves. I expect the expansion of seats will decrease a focus on legal documents and focus more on expanding the objectives of a particularly political organization, which abuses the judiciary.
In this hypothetical scenario we don’t know what precipitated the 6-3 majority.