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There's a very obvious cat and mouse diplomatic game that's playing out now between the capitals of Washington, Riyadh, and Ankara. And the key questions are, how is the US going to react to the disappearance of Jamal Khashoggi, the Washington Post columnist and Saudi dissident, and what level of responsibility is Saudi ultimately going to take for his disappearance and perhaps, indeed, his killing.
And the US has taken steps to react. Steven Mnuchin, the US Treasury secretary, as of today is not going to the so-called Davos in the Desert - that's an investment conference that's held in Saudi Arabia that last year, the Saudis claimed, brought in 25 per cent of the global economy in terms of who was actually represented there. And this year finance ministers from the UK, from France, from Holland, and now the equivalent from the US have all pulled out along with a host of big-hitting commercial companies. That conference still has enough people to go ahead, but it's clear that the US is sending smaller public signals to Saudi Arabia that they're not happy.
Now Mr Trump has particularly pointed at a $110bn arms deal that he agreed with Saudi back when he visited on his first ever trip abroad as a president last year. Now, not all that money has come through yet. It's actually a 10-year deal. Some people say it's a joke deal. But $14.5bn has already come through. That's for tanks, munitions, helicopters, training, and I'm told by sources that there is more going through Congress even right now, although it hasn't yet been officially announced. That means a huge amount of money is on the table for the US, and for all the things that Trump has promised his base - the defence industrial complex - he says 450,000 jobs are at stake through that deal alone in nearly every state in America.