William Happer, President Donald Trump’s reported pick to lead a new panel on climate change, is a science denier with a history of controversial comments.

In one case, he compared carbon to Jews in Nazi Germany.

The Washington Post reported on Wednesday that Happer, a retired Princeton physics professor with no expertise in climatology, will lead a panel called the Presidential Committee on Climate Security.

Happer, however, has claimed rising carbon dioxide levels not only aren’t harmful but also are actually beneficial.

“The demonization of carbon dioxide is just like the demonization of the poor Jews under Hitler,” Happer said on “Squawk Box” on CNBC in 2014. He added: “Carbon dioxide is actually a benefit to the world, and so were the Jews.”