Dude, I watched the entire 30 minutes earlier today. It was really weird. If I had to guess, it was about 27.5 minutes of Trump ranting/raving. The best theory is that the interview was eventually terminated because someone in the Fox control booth decided that POTUS was increasingly incriminating himself with each sentence. I can't recall an instance where an interviewer had to tell POTUS that POTUS was probably busy (on FLOTUS's birthday, nonetheless), after fidgeting like mad during the whole spectacle. Trump was yelling into his phone microphone towards the end of the interview. So weird! Edit: yeah basically this
Any legitimate, balanced, news organization would have let him speak for as long as he wanted, because what he was doing was NEWS. Faux News, being a Trump propaganda organization rather than a news company, did what was best for their "product" - The President - and pulled the plug. Propaganda at its finest. ... the interview was eventually terminated because someone in the Fox control booth decided that POTUS was increasingly incriminating himself ...