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Former "Celebrity Apprentice" host Donald Trump is trashing successor Arnold Schwarzenegger — and billing himself as the true "ratings machine" — in a pair of scathing tweets.

It's a curious jab by President-elect Trump, who remains an executive producer on the long-running business competition reality show. He didn't hold back Friday morning — hours before he was set to get an intelligence briefing on Russia — slamming Schwarzenegger and the program's skimpier ratings. Viewership dropped 44 percent from the first episode of the last season, when Trump was still the host.

Related: Schwarzenegger and Trump Switch Roles in Ironic Twist of Fate

Wow, the ratings are in and Arnold Schwarzenegger got "swamped" (or destroyed) by comparison to the ratings machine, DJT. So much for.... — Donald J. Trump (@realDonaldTrump) January 6, 2017

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being a movie star-and that was season 1 compared to season 14. Now compare him to my season 1. But who cares, he supported Kasich & Hillary — Donald J. Trump (@realDonaldTrump) January 6, 2017

Schwarzenegger, the former Republican governor of California who favored Ohio Gov. John Kasich in the GOP primary, responded to Trump on Twitter, saying that "there's nothing more important than the people's work" and he hopes Trump works "for ALL of the American people as aggressively as you worked for your ratings."

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. — Arnold (@Schwarzenegger) January 6, 2017

Variety reported last month that Trump would remain an executive producer on the star-studded version of "The Apprentice," which is produced and owned by MGM and airs on NBC, receiving a per-episode fee in the "low five-figures."

Trump tweeted in response that he would have "zero time" to devote to it.

I have NOTHING to do with The Apprentice except for fact that I conceived it with Mark B & have a big stake in it. Will devote ZERO TIME! — Donald J. Trump (@realDonaldTrump) December 10, 2016

But his decision to troll "The Apprentice," the show that helped rebuild his brand, may be more calculated than it appears, said Jason Mittell, the author of the book "Television and American Culture."

"Any publicity is good publicity, and this is a no-loss situation," said Mittell, a professor of film and media culture and American studies at Middlebury College in Vermont. "If he mocks the new 'Apprentice' and highlights how Schwarzenegger is a loser and those ratings continue, then it makes him look good. If he mocks Schwarzenegger and he drives people to watch it more, than he gets paid anyway."

Mittell added that Trump's personal brand is more important than a reality TV show over which he has no real control. NBC severed business ties with Trump in June 2015 over his "derogatory statements" about immigrants while on the campaign trail.

"It's always about him," Mittell said. "To me, what he’s basically highlighting is this constant message that he's a winner and everyone else is a loser. And Schwarzenegger, too, because he didn't support him."

Mittell also pointed out that it isn't all that fair to compare the first season of "The Apprentice," which aired in 2004, to this latest celebrity incarnation.

"Primetime ratings were all much higher back then," he said. "Fewer people are watching conventional television today."