Does Donald Trump's political platform deter immigrants?

Trump's political platform is in flux, more so now that he's ditched Steve Bannon - Trump was anti NAFTA under his advisor's influence, but now seems pro and is talking about renegotiation. But where immigration is concerned, the president was sending out consistent signals on a regular basis: he wanted immirgant number reduced. One effect of his February 2017 ban on incomers from 7 Muslim countries was the revocation of some 60,000 visas. The number itself is actually small in terms of the overall total, but more important is the impact of that news overseas, where people are less attuned to the nuances of American politics but can easily read signals suggesting they're unwelcome. A report from US Customs and Border Protection noted a 40% drop in people apprehending crossing illegally from Mexico - the first decrease since figures started to be recorded in 2000. Rhetoric about rounding up 11 million people has an effect, as has talk about a policy shift allowing courts to separate children from migrant parents. It's less about the impact of policy specifics than the overwhelming impression potential immigrants have thanks to Trump's chaotic use of Twitter and random speech declarations that America is a country that will no longer welcome them.