Analysis: Frank Gardner, BBC Security Correspondent
Behind the red carpet welcome and the official press briefings there are signs of real strain in the 71-year old US-Saudi strategic partnership.
Whatever polite words the Saudis may utter in public, for them, President Obama is the living embodiment of their disappointment with the current US administration.
The White House too has its own frustrations with Riyadh, some of which have spilled over into public comments.
In short, the relationship is not broken - Saudi Arabia and the US still need each other - but their alliance is probably under more strain now than at any time since the 1973 Arab-Israeli war.
Claritas est etiam processus dynamicus, qui sequitur mutationem consuetudium lectorum. Mirum est notare quam littera gothica, quam nunc putamus parum claram, anteposuerit litterarum formas humanitatis per seacula quarta decima et quinta decima.
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