>Because the list of countries was drafted by Obama's administration.
So? Obama isn't president anymore. Trump campaigned on Obama's policies, especially his foreign policy, being ineffective. If anything this shows laziness on behalf of the Trump administration – not a good sign.
This is looking at two effects and deciding one of them is the cause.
Saudi Arabia is a close ally of the US. That's the really horrific truth, and that's why Trump has business there and not in countries which the US is less friendly with.
We can't really know whether it's because of his biz interests or because America is friendly with the Saudi regime.
This is why Trump's refusal to divest himself from his businesses is an unacceptable conflict of interest even if he insists it is fine and there are no grounds to question it.
I also posted this above, but the specific list is seven countries DHS deemed to be high-risk around February 2016, denying them Visa Waiver privileges:
"Have you traveled to, or been present in, Iraq, Syria, Iran, Sudan, Libya, Somalia, or Yemen..."
