He's Just Staying With The Awkward Klingon Joke, I See.

 It's the Day's Day of Days! Because Choujyu Sentai Liveman.

I assume this is based on something Harris said, which runs into the problem that Real Trump is regularly babbling about Hannibal Lecter for some unfathomable reason, which underlines that this... isn't a big deal. But I don't know, because Muir frequently believes nonsense that isn't true, so it might just be something that never happened.

And I don't care.