AdvertisementBiden Rejects Calls For Impeachment Testimony As A Trump Ploy To 'Divert Attention'11:17Download AudioResumeDecember 09, 2019Rachel MartinBobby AllynfacebookEmailFormer Vice President and 2020 presidential candidate Joe Biden listens as former Secretary of State John Kerry introduces Biden to Iowans on Friday. (KC McGinnis for NPR)