The economic toll alone would be significant: a May report by the right-leaning American Action Forum
estimated that removing all undocumented workers and barring their reentry would cost somewhere between $400 billion and $600 billion, while reducing real GDP by over $1 trillion.
For that reason in part, the plan would run into headlong resistance from the Chamber of Commerce wing of the party, which has favored a path to citizenship. The extent to which business-minded Republicans in Congress adjust their views to match Trump’s position will test how deeply his win rewires traditional conservative orthodoxy.