What was clear was that the outcome for the "Dreamers" themselves was still unresolved and subject to much further debate and negotiation — and that the politics of immigration, which has defeated Congress for years, remained as tricky and explosive as ever. After winning the White House on a campaign that was remarkably harsh toward immigrants and revolved around construction of an enormous wall along the entire border with Mexico, Trump's sudden pivot infuriated some of his closest allies, and seemed to contain more potential to alienate his base than any of his other unconventional moves.