Nielsen ouster lays bare Trump's own immigration crisis

The forced resignation of Homeland Security Secretary Kirstjen Nielsen is not just the usual story of an administration racked by chaos and the short shelf life of almost everyone who works for an imperious and grudge-bearing President.

Nielsen was hardly a moderate out of step with President Donald Trump on his signature issue of immigration. She became the administration's public face of the zero-tolerance policy that caused widespread outrage after hundreds of migrant children were separated from their parents.

But she is nonetheless paying the price for a crisis exacerbated...