This moment is testing the relationship of the two men, both of whom are politically divisive, fiercely combative and have outsize egos.

When the U.S. and Iran met for nuclear talks a decade ago, Israeli Prime Minister Benjamin Netanyahu railed against an emerging deal from the world’s most public stages, including in a fiery speech to Congress seen as a direct challenge to the Obama administration as it was wrapping up the talks.

President Donald Trump lands on Tuesday in a region that speaks his language: the Gulf. There will be talk of trillions of dollars, pageantry and a lot of gold. There are also reports of a Qatari gift of a luxury jumbo jet to be used as Air Force One — which would be a jumbo ethical and security issue.