核選擇是主黨開的頭，但大法官的核選擇是共和黨開始的，見wiki

https://en.wikipedia.org/wiki/Nuclear_option In November 2013, Senate Democrats led by Harry Reid used the nuclear option to eliminate the 60-vote rule on executive branch nominations and federal judicial appointments, but not for the Supreme Court.^[1] In April 2017, Senate Republicans led by Mitch McConnell extended the nuclear option to Supreme Court nominations in order to end debate on the nomination of Neil Gorsuch.