During an appearance on Late Night, probable GOP presidential candidate Cruz told host Seth Meyers that "satellite data demonstrate for the last 17 years there’s been zero warming -- none whatsoever. It’s why, remember how it used to be called global warming? And then magically the theory changed to climate change? The reason is, it wasn’t warming, but the computer models still say it is, except the satellites show it’s not."
After playing that clip, Todd asked Brown what his response was -- and the California governor didn't mince his words.
"That man betokens such a level of ignorance and a direct falsification of the existing scientific data," he said. "It's shocking and I think that man has rendered himself absolutely unfit to be running for office."
Brown, a longtime environmentalist, then discussed California's desperate state of affairs -- including warnings that if the current drought continues, it could run out of water within a year.
"This is a serious matter we're experiencing in California, as kind of a foretaste," he said, "but there is no doubt that into the future, we're going to have more problems."
Watch a video of the exchange below via NBC below.