With the confirmation of Amy Coney Barrett, the idea of expanding the US Supreme Court has caught fire among some Democrats. With a 6-3 conservative majority on the court, prominent progressive Democrats like Representative Alexandria Ocasio-Cortez argue that if Democrats win this election term, they should seriously consider increasing the number of justices. In this context, is an expansion of the US Supreme Court really possible?
Assuming Democrats control the presidency, senate, and house in 2021, what can Republican legislators do to stop a SCOTUS expansion?