Donald Trump has postponed an event in which he was expected to unveil Mike Pence as his vice-presidential candidate After the tragedy in Nice, France, in which at least 84 people were killed "In light of the horrible attack in Nice, France, I have postponed tomorrow's news conference concerning my Vice Presidential announcement," Trump said in a tweet In his initial tweet following the attack, Trump described the attack in Nice as "horrific" and asked, "When will we learn?
