Straight out of the horse's mouth.

"US President Donald Trump indicated in an interview published Wednesday that, although he could remove troops from the Middle East, citing cheaper oil as an explanation, one reason not to do so is concern for Israel’s security.

“Now, are we going to stay in that part of the world? One reason to is Israel,” Trump told the Washington Post.

“Oil is becoming less and less of a reason because we’re producing more oil now than we’ve ever produced,” he added, appearing to envision a world where the US would be less beholden to Saudi Arabia. “So, you know, all of a sudden it gets to a point where you don’t have to stay there.”

https://www.timesofisrael.com/trump-says-us-troops-will-remain-in-middle-east-for-israels-sake/?utm_source=The+Daily+Edition&utm_campaign=daily-edition-2018-11-28&utm_medium=email