The White House ripped Gavin Newsom as a nobody “frolicking” in Switzerland Wednesday after the California governor whined about getting shut out of an event in Davos, claiming the Trump administration got him banned.

The flare-up marked the latest escalation in the feud between the Trump admin and the Democrat, who is widely seen as a potential 2028 presidential contender and has been using his trip to the World Economic Forum to repeatedly take aim at the commander-in-chief on the international stage.

Newsom’s press office claimed the White House and US State Department denied the governor entry to a “fireside chat” at the Davos clubhouse hosted by Fortune that he’d been invited to speak at.

The White House fired back at Newsom’s claim, calling him a “third-rate governor” who should be minding the affairs of his home state, rather than “frolicking around Switzerland.”

“No one in Davos knows who third-rate governor Newscum (sic) is or why he is frolicking around Switzerland instead of fixing the many problems he created in California,” White House spokeswoman Anna Kelly told The Post in an exclusive statement.

Newsom, earlier Wednesday, slammed Trump’s speech at the forum as “remarkably boring,” after the president assured world leaders that he would not use force to seize Greenland.

“It was remarkably insignificant,” he said. “He was never going to invade Greenland. It was never real.”

The White House’s “Rapid Response” X account then posted: “The failing Governor of California (rampant with fraud) watches from the corner cuck chair as @POTUS delivers a true masterclass in Davos. Embarrassing!” along with video of Newsom watching Trump’s speech.

An official from the Newsom administration also told The Post Wednesday that Fortune had invited the governor to speak at the “fireside chat” at USA House on Jan. 13 and that his office accepted on Monday.

The decision came after multiple Trump administration officials, including Treasury Secretary Scott Bessent, had spoken at the event, the official added.

As a substitute, USA House offered Newsom a 10 p.m. “nightcap reception.”

The official said that Bessent later told them, “I was told he was asked to give a speech on his signature policies but he’s not speaking.”

“How weak and pathetic do you have to be to be this scared of a fireside chat?” Newsom wrote on X.

Newsom hasn’t shied away from meddling in US affairs publicly during his jaunt overseas.

The governor earlier this week called the president a “T-Rex,” implying Trump would bully European leaders and urging them to stand up to him.

Despite Trump’s remarks at a Tuesday press conference recalling their “good relationship” and later calling him a “good guy” in Davos, Newsom did not hold back.

“It’s time to stand tall and firm and have a backbone. I can’t take this complicity, people rolling over,” he told reporters. “I should have brought a bunch of kneepads for all the world leaders.”

Newsom also took aim at Bessent, calling him “out of touch.”

The White House snapped back, slamming Newsom for the remarks.

“Gavin Newsom should stop undermining the United States on the world stage and start fixing his own broken state back home,” White House Deputy Press Secretary Kush Desai told The Post Tuesday.

Bessent also fired back, ripping the California governor as “too smug, too self-absorbed and too economically illiterate.”

“Governor Newsom, who strikes me as Patrick Bateman meets Sparkle Beach Ken, may be the only Californian who knows less about economics than Kamala Harris,” Bessent added.

But the war of words was far from over — Newsom is set to take the stage at the forum Thursday, where he will address a crowd of business elites and politicians, aiming to position California — and himself — as an ally to Europe.

Analysts predicted the Democrat could have even sharper words for the Republican administration as he seeks to raise his profile ahead of 2028.