Former California Gov. Arnold Schwarzenegger (R) on Wednesday chided President TrumpDonald John TrumpGrassroots America shows the people support Donald Trump Trump speaks to rebel Libyan general attacking Tripoli Dem lawmaker: Mueller report shows 'substantial body of evidence' on obstruction MORE for his recent criticism of the late Sen. John McCainJohn Sidney McCainTrump gives nod to vulnerable GOP Sen. McSally with bill signing Democrats need a 'celebrity' candidate — and it's not Biden or Sanders Juan Williams: The high price of working for Trump MORE (R-Ariz.), calling Trump's remarks "unacceptable."

The actor suggested to The Atlantic that Trump should talk with first lady Melania TrumpMelania TrumpThe Hill's Morning Report — Mueller aftermath: What will House Dems do now? Trump to visit Japan in May to meet with Abe, new emperor Trump dodges media's questions after Mueller report release MORE before he takes to Twitter. The first lady launched "Be Best," a campaign that advocates for children's well-being and discourages online bullying.

"Why don’t you go and sit down with your wife for just a few minutes, Mr. President, and listen to the First Lady when she’s talking about stopping online bullying," Schwarzenegger said. "That is a really great message. Which way do we go? Your way, or her way."

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Schwarzenegger praised McCain as "an unbelievable person," and said the country would be "lucky if everyone in Washington followed McCain’s example.

"So an attack on him is absolutely unacceptable if he’s alive or dead—but even twice as unacceptable since he passed away a few months ago," he said.

Trump has in recent days gone after McCain, who died last August after a battle with brain cancer. The president has specifically targeted the Arizona Republican over his ties to a dossier of allegations about Trump's alleged ties to Russia, and the late senator's 2017 vote against the repeal of ObamaCare. 

Trump escalated his attacks on Wednesday when he lamented that he was not thanked for giving McCain "the kind of funeral that he wanted."

"We sent him on the way, but I wasn’t a fan of John McCain," Trump said. Trump was not invited to McCain's funeral.

Schwarzenegger, who left office in 2011, has been a regular critic of Trump and often laments the current state of the Republican Party.

A former bodybuilder, he took a more personal jab at the president on Wednesday, joking to The Atlantic that Trump "must be working out every day because he’s so unbelievably in shape."