Barack Obama made four visits to Saudi Arabia; in June 2009, March 2014, January 2015 and April 2016.

On May 21 President Donald Trump delivered a 36 minute address in Riyadh; his first speech of his first foreign trip.

Both visits marked the chance to make their views on Saudi Arabia and the wider Arab world very clear.

But it's important to note that both Mr Obama and Mr Trump moderated their campaign trail views once they entered the White House.