Saturday night’s debate between the men who would like to be the next Republican president was sidetracked by a testy exchange over the last one. Donald Trump and Jeb Bush sparred over George W. Bush’s legacy in a battle that could have a real impact on the South Carolina primary.

“The war in Iraq was a big, fat mistake,” Trump said. “There were no weapons of mass destruction.” The billionaire then said that the WMD intelligence wasn’t just mistaken. “I want to tell you: they lied.”