The Trump administration is days away from announcing a plan to limit the automatic provision of U.S. citizenship to people born in the United States whose parents are noncitizens visiting the country, a senior administration official told the Washington Examiner on Monday.

The move is meant to go after “birth tourism,” which refers to an underground market in which pregnant women travel to the U.S. to have a baby that will immediately be a citizen. The 14th Amendment states any child born on U.S. soil is a citizen, no matter the status of the parents.