The Voice Blake Shelton apologizes for old tweets: "I have no tolerance for hate" 08/18/2016 Blake Shelton apologized on Wednesday for a number of controversial past tweets. Read More RELATED NEWS Gwen Stefani joins CNN's New Year's Eve broadcastChristina Aguilera denies she quit 'The Voice' due to Gwen StefaniChristina Aguilera slams 'The Voice' -- "It's not about music" TAGS: Ellen DeGeneres Blake Shelton