The Trump administration has a new target on the immigration front — pregnant women visiting from other countries — with plans as early as this week to roll out a new rule cracking down on “birth tourism,” three administration officials told Axios.

Why it matters: Trump has threatened to end birthright citizenship and railed against immigrant “anchor babies.” The new rule would be one of the first tangible steps to test how much legal authority the administration has to prevent foreigners from taking advantage of the 14th Amendment’s protection of citizenship for anyone born in the U.S.

“This change is intended to address the national security and law enforcement risks associated with birth tourism, including criminal activity associated with the birth tourism industry,” a State Department official told Axios.