President Donald Trump issued a flurry of executive orders and edicts on immigration and enforcement in the first days of his new administration, seeking to counter what he called “a large-scale invasion at an unprecedented level.

Here's a guide to what birthright citizenship is, what happens if Trump's order ends it, and what comes next after lawsuits were filed.

Two dozen Democratic-led states and cities are challenging President Donald Trump’s bid to end birthright citizenship in court, a major constitutional challenge to one of the White House’s signature policies.