Mr. Trump is planning to attempt to deny birthright citizenship to the children of immigrants who are in the U.S. illegally, according to the incoming officials. The U.S. government has long interpreted the U.S. Constitution to mean that those born on American soil are citizens at birth, regardless of their parents' immigration status.

The president’s Day 1 actions included directives that fly in the face of legal limits on involving the military in domestic operations and the constitutional guarantee of birthright citizenship.

State and local leaders across the country are bracing for a tidal wave of aggressive immigration policies and possible mass deportations that President Donald Trump has vowed to enact in the hours and days following his inauguration Monday.

President Donald Trump moved to end a decades-old immigration policy known as birthright citizenship when he ordered the cancellation of the constitutional guarantee that U.S.-born children are citizens regardless of their parents’ status.

The lawsuit to block the president’s executive order is the first salvo in what is likely to be a long-running legal fight over immigration policy.