 Diaz-Balart made history when he substituted for Brewer on "MSNBC Live" for the week of June 20 through 24, 2011, in the show's 12 PM time slot, making him the first U.S. journalist to broadcast both English and Spanish newscasts on two networks simultaneously.On May 20, 2014, MSNBC announced that Diaz-Balart would begin hosting the 10 AM news hour beginning in mid-June.He replaced Chris Jansing, the newly named NBC News Senior White House Correspondent.