Source: firings of pollsters about pacifying Trump; NYT: intel officials hesitant to tell Trump about ramped up operations against Russia; Campaign: Buttigieg canceling events through Wednesday after deadly police shooting in South Bend, Indiana; Biden slams Trump for trying to "divide the country"; Biden: if I'm Dem nominee, I plan on winning GA, NC & SC; NYT reveals youngest known child separated at border; Gloria Vanderbilt dies at 95 after battle with cancer via Knit