Someone worked out it would cost the American economy a trillion dollars to remove immigrants back to their country of origin - think about the number of immigration officers required to process the forms: the lawyers necessary to appeal the decision. Chaos in the courts - jobs unfilled. They really haven't thought this through.Trump was elected on a promise to make everyone better off, get rid of immigrants, restore law and order ect.
Reform, as far as i know is a single issue party and that is immigration, legal and illegal.
Once the public learn about Nigels plans for the economy and the NHS, they may think twice about voting for reform.
Then again, Boris won a landslide on a single issue, so who knows.