Newt Gingrich tweeted on Monday calling for Secretary of State John KerryJohn Forbes KerryTrump's dangerous Guantánamo fixation will fuel fire for terrorists Tech beefs up lobbying amid Russia scrutiny Overnight Tech: Senate Dems want FCC chief recused from Sinclair merger | Tech rallies on Capitol Hill for DACA | Facebook beefs up lobbying ranks MORE to resign because of Kerry's recent comments on climate change.

He said his wife, Callista, pointed out he had misspelled Kerry’s name, as if he were related to former Sen. Bob Kerrey (D-Nev.).

On Sunday, Kerry warned in a speech in Indonesia that climate change is a “weapon of mass destruction” and is just as much of a threat as terrorism and poverty.

Gingrich expressed disbelief over Kerry’s remarks.

He accused Kerry of being “out of touch with reality.”

Gingrich said Kerry is crafting foreign policy in a “fantasy world.”

When Gingrich ran for the Republican presidential nomination in 2012, he said global warming “hasn’t been totally proven.”

Last month, on CNN’s “Crossfire,” which he co-hosts, Gingrich said the planet was warmer during the age of dinosaurs.

“The age of the dinosaurs was dramatically warmer than this is right now, and it didn’t cook the planet,” Gingrich said. “In fact, life was fine.”