evidence: Why Vivek Ramaswamy got the most 'boos' at the Republican debate as he went after Haley, Christie "We need somebody ... who absolutely is going to be a fighter," he said. On the fourth Republican debate stage, with just weeks to go before the Jan. 15 Iowa's caucuses begin the 2024 primary, Vivek Ramaswamy's night kicked off with a question about whether he can unify the country despite having a bit of a self-professed "know-it-all" demeanor. [...] The two had a heated exchange after Christie attacked Ramaswamy in defense of Haley, "If you want to disagree on issues, that's fine, and Nikki and I disagree on some issues, but I'll tell you this: I've known her for 12 years, which is longer than he's ever started to vote in a Republican primary," Christie said.