Arnold Schwarzenegger is hitting back at Donald TrumpDonald John TrumpIvanka Trump, Jared Kusher's lawyer threatens to sue Lincoln Project over Times Square billboards Facebook, Twitter CEOs to testify before Senate Judiciary Committee on Nov. 17 Sanders hits back at Trump's attack on 'socialized medicine' MORE for mocking the low ratings of his debut as host of “New Celebrity Apprentice.”

"Wow, the ratings are in and Arnold Schwarzenegger got 'swamped' (or destroyed) by comparison to the ratings machine, DJT,” tweeted the president-elect, who is still the show’s executive producer.

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"I wish you the best of luck and I hope you'll work for ALL of the American people as aggressively as you worked for your ratings,” the "Terminator" star shot back.

Monday’s premiere drew 4.9 million viewers — a 44 percent drop from the 2015 season premiere, which Trump hosted.

Schwarzenegger’s debut suffered as a result of being forced to compete with the premiere of ABC’s "The Bachelor," which scored 1.7 million more viewers.