WATCH: CNN’s Tapper Fact Checks Ocasio-Cortez, Sanders. It Gets Ugly, Fast.

CNN’s Jake Tapper fact-checked Democratic socialists Alexandria Ocasio-Cortez and Sen. Bernie Sanders (I-VT) during a segment that aired on Friday over their claims that a study funded by the Koch brothers showed that universal health care would save the U.S. government money.

Tapper noted that the study, conducted by The Mercatus Center, was written by senior research strategist Charles Blahous, who said that Ocasio-Cortez’s and Sanders’ claims were not what the report concluded.