At the Republican presidential primary debate on Wednesday, former New Jersey Gov. Chris Christie and businessman Vivek Ramaswamy engaged in a heated exchange over Nikki Haley's foreign policy views. Christie took the argument to President Donald Trump, and Ramaswamy accused Haley of floating a conspiracy. The debate concluded without any physical altercation, but it was one of the most contentious fights yet at one of the Republican presidential primary debates, with Christie speaking dramatically less than the other three candidates.