Vivek Ramaswamy confronted Sen. Joni Ernst over her criticism of his position on Israel at an Iowa political fundraising event last Friday, according to two sources who witnessed the tense exchange and video obtained exclusively by NBC News. The two politicians ran into each other as Ernst, R-Iowa, was exiting a podcast studio at Rep. Mariannette Miller-Meeks' "Triple MMM Tailgateā fundraiser and Ramaswamy was heading in. Ramaswamy shook Ernst's hand and held onto it for most of a minute as he aired his frustration. "You might want to understand my Israel policy before commenting," said Ramaswamy, who was upset about...