Donald Trump's behavior over the last week has been "very self-destructive" to his campaign, former House Speaker Newt Gingrich said Wednesday, comparing the Republican nominee to a Hall of Fame quarterback who is in the midst of an interception-throwing slump. "Trump is still behaving like as though it was the primaries and there were 17 candidates. He has not made the transition to being the potential president of the United States, which is a much tougher league," Gingrich said in an interview with Fox Business' "Mornings with Maria." "People are going to watch you every single day. They’re going to take everything they can out of context, and he is not yet performing at the level that...