"Already, he was attacked on this trip by one of his biggest supporters, Roger Stone, who said that the picture of Trump bowing to the Saudi King to receive the “Collar of Abdulaziz al-Saud” "makes me want to puke."  I suspect that many among Trump’s base will have a similar reaction."

Actually, Trump curtsied to the Saudi King after having mocked Obama on Twitter a few years ago for his more customary formal bow. And no, Trump's base won't chide him for his inconsistency over that or anything else. There really is nothing Trump can do at this point, up to and including shooting someone dead that will make his base change their minds about their Dear Leader. This is cult-like behavior. Expect more of the same.