Possibly FDR when he packed tried to pack the Supreme Court from 5 to 13.
He got his wrists slapped for his efforts, and was better behaved after that.
The compromise ended in 9 on the SCOTUS.
Not 100% true. Tyrant FDR was annoyed that the Supreme stuck down his socialist Raw Deal agenda and sought authority to add a Justice to the Supreme Court to compliment every Justice that was over 70 and six months of age, up to six total.
There were nine Justices on the Supreme Court at the time. Thankfully, some corageous members of Congress said no and the tradition-breaking scheme was shot down.
Unfortunately, King Roosevelt ignored another American tradition and had four terms in office and made over the court anyway.