What does "margininalizing immigrants" refer to, vis-a-vis policy and enforcement of immigration law? Trump's stance on H1-B is quite clear from his policy pap

What does "margininalizing immigrants" refer to, vis-a-vis policy and enforcement of immigration law? Trump's stance on H1-B is quite clear from his policy papers, speeches, as well as those policy documents written by his main immigration advisor Sen. Jeff Sessions. This is all out in the open for anyone to read, but I suspect you just wanted to take a gratuitous shot at Trump's supporters, so, good job.