The champions of U.S. Supreme Court reform should first consider the record of nations that wound up packing and purging their judiciaries.

The Democratic nominee envisions a bipartisan group of constitutional scholars who would, after 180 days, make recommendations to reform the court system, which Biden calls "out of whack."

Some Democrats are open to packing the Supreme Court in response to what they perceive as an illegitimate court appointment. But the move could cause a "spiral" of retaliation, experts say.