Stephen Miller, White House senior advisor for policy. (Photographer: Andrew Harrer/Bloomberg)
(Bloomberg Businessweek) -- Kirstjen Nielsen’s abrupt ouster as Homeland Security Secretary highlights two things about the current state of Donald Trump’s presidency. First, Trump is angry that he isn’t making progress on curbing immigration—migrant families are surging to the southern border in record numbers, and there’s no wall or prospect of getting one—and knows that his reelection could hinge on turning this around. Second, so...