The popular narrative is that the co-hosts of MSNBC's "Morning Joe" — Joe Scarborough, in particular — are too cozy with presumptive Republican presidential nominee Donald Trump. Just this week, the National Review's Jonah Goldberg declared that the show's "Trump worship is unwatchable."

So of course Trump decided to pick a Twitter fight with Scarborough on Friday. It makes no sense, which is why we shouldn't be surprised at all.

https://twitter.com/JoeNBC/status/728653323948179457

Let's get a few things straight here. It is true that Scarborough, a former Republican congressman from Florida, previously declared his support for Bush, a former Florida governor. After Bush dropped out, Scarborough said he planned to vote for Kasich. He made these declarations, by the way, as he was fending off accusations that he and co-host Mika Brzezinski were promoting Trump's candidacy. The longtime argument from both hosts has been that they were among the earliest believers in the viability of Trump's campaign, but that belief shouldn't be mistaken for support.

So what set Trump off? Scarborough, a contributor to The Washington Post's opinion pages, said on the air Thursday that he couldn't bring himself to vote for Trump in November as long as the real estate magnate stands by his call to temporarily ban all foreign Muslims from entering the United States.

"That’s a loser," Scarborough said. "It’s a loser with the majority of Americans, and you’ve got Republicans, like me, [who] just — I’m not going to vote for him. ... I’m never going to vote for a guy who says they are going to ban somebody because of the god they worship."

And then, during a panel discussion on "Morning Joe" on Friday, the prospect of a third-party candidate did come up.

"There is not a better time for someone to run as an independent candidate," Scarborough said at one point. At another point, he seemed skeptical: "Is it too late? Because I've always heard you have to do it by March." (Fact check: It is either too late or very close to being too late.)

In any case, it didn't sound like he was "pushing hard," as Trump suggested.

So is "Morning Joe" "rapidly fading?" In April, the show averaged 596,000 total viewers, beating CNN's "New Day," which averaged 438,000, according to Nielsen. In the first quarter of 2016, the show's ratings spiked 84 percent over the same period in 2015. (Fox News Channel's "Fox & Friends" remains king of the morning on cable news.) As I've noted before, the election seems to be boosting cable news ratings, in general. The numbers don't support Trump here.

As for the staying power of this feud, it's worth noting that Trump let Scarborough cut him off and go to commercial during an interview in December, so we know he can tolerate some criticism and tough treatment.

Perhaps it's as simple as finding a new favorite outlet. After feuding with Fox News Channel during much of the primary season, Trump has been a near-constant presence on "Fox & Friends" lately. When he made that absurd link between Ted Cruz's father and John F. Kennedy's killer on Tuesday, it was during just one of his five appearances on the program in a span of nine days.

If nothing else, though, this episode should prove that nobody should get too comfortable being in the good graces of Republican Nominee Donald J. Trump. And as Bill O'Reilly and all of Fox News can attest, Trump can often be toughest on those he expects to be the friendliest