It's not about the countries themselves. Its about the people, since its about immigration. Ireland was a fucked up, abused, subjugated shithole country when a lot of Irish immigrants decided to leave for America at the beginning of the 20th century. Many places in Europe were not much better, however many of those people left for the USA and made it the powerhouse it is today.
So whether you are on the left or on the right, if you are American, Trump stopping immigration from "shithole" countries should be raising the heckles on your back.
Hell Im not American and the hypocrisy disgusts me.