Watch CBSN Live

Does letter from Biden insider hint at 2016 run?

A letter from a Joe Biden insider is raising new questions about the vice president launching a run for the White House. On the GOP side, Donald Trump and Ben Carson are threatening to boycott the next debate if organizers don't make it shorter. "The Hill" reporter Kevin Cirilli joins CBSN with more.
View CBS News In
CBS News App Open
Chrome Safari Continue