Evan Agostini/Invision/AP George R. R. Martin says there has never been a presidential candidate more unfit to lead the nation than GOP nominee Donald Trump.

George R. R. Martin knows all about the despicable nature of politics. Joffrey Baratheon, anyone?

But the acclaimed author has now turned his attention from the fictional skulduggery of Westeros to the very real race for the White House, with a blistering blog post about GOP nominee Donald Trump.

“In my lifetime, there has never been a presidential candidate more unfit to lead this nation,” the 68-year-old writer posted on LiveJournal on Friday.

“You don’t need to like Hillary [Clinton]. You don’t need to listen to what Hillary says about Trump, or what I say about Trump,” he added. “You just need to listen to Trump. If you can do that, and still consider voting for him... well…”

Martin, whose Song of Ice and Fire book series was adapted into the HBO fantasy epic “Game of Thrones,” said he reached his damning conclusion after examining the rival campaigns’ political ads in New Mexico, where he lives.

The acclaimed author pointed out how the Trump attack ads against Democratic nominee Hillary Clinton were “made of assertion, innuendo, and name-calling,” but ultimately had “no substance.”

He found Clinton’s attack ads, however, to be “much more truthful.”

There's no name-calling either. Clinton doesn't need to label Trump as 'crooked' or 'a liar' or link him with 'perverts.' Clinton's ads just show Trump being Trump. George R. R. Martin on Hillary Clinton's anti-Trump adverts.

“Hillary does not need to use the sort of hoary attack ads that Trump is using,” Martin added. “She only needs to present him as he is, and let his own words condemn them.”

Martin admitted the brash businessman did have an advantage over previous presidential candidates who’d lost the election over “trivial” and “insignificant” things.

“[Trump] has said the vilest things any presidential candidate has said since George Wallace, and he’s rising in the polls,” he wrote. “He has boasted that he could shoot someone dead on Fifth Avenue and still not lose any votes. I am beginning to think he was right.”

Editor’s note: Donald Trump regularly incites political violence and is a serial liar, rampant xenophobe, racist, misogynist and birther who has repeatedly pledged to ban all Muslims — 1.6 billion members of an entire religion — from entering the U.S.

Donate below to support women, Latinos, Muslims, other groups Donald Trump has insulted.