FDR wanted to pack the court. Congress didn't, but they could have. Does Congress have the power to reduce the number of Supreme Court justices?

This Is How FDR Tried to Pack the Supreme Court
This Is How FDR Tried to Pack the Supreme Court

Congress can reduce the number of Justices. However, I don't know if they can remove a justice or if they have to wait until a justice dies or retires.

FDR wanted to pack the court. Congress didn't, but they could have. Does Congress have the power to reduce the number of Supreme Court justices?
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