Biden wouldn’t do it, because his handling of the Anita Hill investigation is why Clarence got his seat in the first place it’s not within the powers of the president to change the number of judges, it’s set by federal statute by Congress.

Fixed it for you. All any president can do about it is pressure Congress. And Biden never had a Senate majority that would ever consider either expanding the court or impeaching the corrupt justices (Manchin and Sinema, for starters).