What are the reasons Rand Paul, the Democrats, and the Republicans are all equally defying the Saudis' explanation for the murdered journalist?
Trump is supportive of the Saudi-Israeli alliance, which MSB has certainly advanced. Important elements of the state, supported by Obama, supported the Iranians against the Saudi-Israeli alliance. If you think the US should have any role in the ME, that pretty much exhausts the possible positions. If you're a complete isolationist, you welcome any development that can distance the US from any ally and any conflict in the region. I would guess that's Paul's position. But we don't know what happened yet, or what MSB's role was. Trump doesn't seem to be letting it affect his position, but maybe's it's too soon to be sure of that. You say the Republicans are "equally defying the Saudi's explanation"--are they? I don't know. You can reject their explanation, you can think they screwed up, you can think they committed a terrible crime, and/or you may feel obliged to say that--and still let it have no effect on your political goals and calculations. The media is obviously pushing this to hurt Trump. Will they give up if it doesn't? Will everyone just get on with business then?
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Maybe. But we still don't know exactly what happened.
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Yes
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It's certainly inexhaustible.