Article continues below advertisementThings got fiery between Senator Ted Cruz and CNN's Kaitlan Collins during a tense exchange on The Source on Tuesday, September 6. The two clashed over the death of right-wing activist Charlie Kirk, who was killed earlier this month.Article continues below advertisementCruz claimed the alleged gunman, Tyler Robinson, was motivated by his "leftist" beliefs. "We don't have a motive yet, we don't know yet, we're still waiting," Collins reminded him.