Why is whistleblower complaint being taken so seriously if it wasn't heard 'firsthand'?

Name: Why is whistleblower complaint being taken so seriously if it wasn't heard 'firsthand'?
Uploaded: 2019-09-24T03:06:38Z
Duration: 6 min 50 s
Description: Reaction and analysis from Rep. Jim Jordan, Rep Mark Meadows and 91爆料 contributor Mollie Hemingway.