IRS whistleblower exposes DOJ's handling of Hunter Biden tax probe.

An IRS whistleblower has spoken out about a sensitive political probe he supervised, which CBS News has determined is the ongoing investigation into the finances of President Biden's son, Hunter Biden. The whistleblower, Gary Shapley, said he became concerned about prosecutors' handling of the investigation and felt duty-bound to sound alarms. The investigation focuses on potential crimes related to outstanding tax debts connected to income earned from a controversial stint as a board member for the Ukrainian energy company Burisma while his father was vice president, and a potential false statement related to a gun purchase.