The former prime minister of Norway was recently detained at the border for previously having visited Iran. Think about that, prime minister of a NATO allied country. The border rules (even before Trump) are whack.
So? The rules were in place before Trump were elected. Let see what else what other laws we can apply to this logic.
* [Equal pay occurs even] after Trump was elected, although it is true that [Equal Pay Act of 1963] was due to JFK-era rules.
* [National Parks exist] after Trump was elected, although it is true that [National Park Service Organic Act] was due to Woodrow Wilson-era rules.
Hes not the greatest guy by far, but don't blame Trump for the mistakes of previous administrations.