(CNN) Before he boarded Air Force One to fly back to Washington on Sunday afternoon, President Donald Trump was asked about a recent Fox News poll that showed him in serious trouble vis a vis the 2020 election. Trump, as he is wont to do, went off at length on his once-favorite network.

The poll showed Trump's approval rating in the low 40s and had him losing by six or more points to Democratic 2020 rivals Sens. Kamala Harris, Elizabeth Warren, Bernie Sanders and former Vice President Joe Biden.

Unsurprisingly, Trump didn't like that. Here's the key bit:

"Well, Fox has always given me -- I'll tell you, Fox is a lot different than it used to be, I can tell you that. ... Fox has changed. And my worst polls have always been from Fox. There's something going on at Fox, I'll tell you right now. And I'm not happy with it."

"There's something going on at Fox."

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