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.

By Gram Slattery and Pesha Magid RIYADH - U.S. President Donald Trump will arrive in Saudi Arabia on Tuesday morning to kick off a four-day swing through the Gulf region, a trip that will focus more on economic deals than on the security crises besetting the region,