Nobody knows. Least of all this spry for his age guy:
Biden, appearing to mispronounce her name as "Lincoln Riley," called her "an innocent young woman who was killed by an illegal," a term many immigrants and advocates find offensive.
"I shouldn't have used illegal, it's undocumented," he told Jonathan Capehart. When Capehart asked, "So, you regret using that word?" Biden responded, "Yes."