That is the topic of my latest Bloomberg column, note I am continuing to see a larger backlash on the Saudi issue than one might have expected. The bigger underlying question is this: given all that has happened, so why is the United States still such an ally of the Saudis?  It’s longstanding and thus not just about Trump’s possible business dealings.  It’s also not just about the oil, here is one excerpt:

One feature of the geography of Saudi Arabia is that its major oil fields stand apart and can be taken over without controlling the major Saudi cities. That is one reason why the Saudis were so wary of Saddam Hussein.

That risk means the Saudis are especially dependent on American military protection. In turn, the U.S. knows it has a lot of leverage over the Saudis, and therefore making deals with the Saudis involves easier enforcement and lower transaction costs. The same cannot be said of deals with Iran. So in the Saudi-Iran rivalry, the U.S. ends up siding with the Saudis.

Historically, Iran has been a very difficult country to capture or control, and the population has fought fiercely to defend Iranian territorial integrity. Iran doesn’t need American protection to the same degree as do the Saudis, and so Iran is more willing to be prickly or openly hostile to the U.S.

Iran shared a border with the former Soviet Union (though not Russia) and shares Caspian Sea rights with Russia, and the two countries often have had close and cordial relations. Iran also is easier than Saudi Arabia for China to reach with its One Belt, One Road initiative, which aims to build close ties with the countries to its west. In sum, Iran is going to diversify its geopolitical bets, which pulls it away from the U.S., even if the issues surrounding nuclear weapons and support for terrorism somehow were resolved.

And this:

Of course, the Saudis have abused their position. They are dependent on the U.S., but they also know America has few other potential regional partners for cooperation on such a large scale. And so the Saudis have engaged in human-rights abuses over the decades, figuring it may harm but will not irrevocably damage relations with America.

There is more at the link, analytical throughout.