The United States of America is planning to implement pregnant women travel ban policy for foreign nationals on Friday.

This development, a practice commonly known as “birth tourism”, is a plan by the Trump administration to make it more difficult for foreign nationals to travel to give birth on US soil to ensure their children become American citizens.

On the date in which such policy will take effect, according to a State Department cable obtained by CNN, January 24, is the set date that was sent on Wednesday to embassies around the world.

According to an announcement by the white house on Thursday, the State Department “will no longer issue temporary visitor (B-1/B-2) visas to aliens seeking to enter the United States for the which is a process that leads to ‘’birth tourism.’’

According to an amended State Department regulation to be published Friday, the ban also involves a denial of temporary visas to visitors to the US if it’s found that the “primary purpose” of travel is for obtaining US citizenship for a child by giving birth in the United States.

On the countries which the rule does not affect,  a State Department official confirmed in a briefing call with reporters Thursday confirmed that 39 countries; most of which are in Europe which that are part of the Visa Waiver Program.

The reason for such sudden rule was revealed by the White House in a statement, which are: to ” to enhance public safety, national security, and the integrity of our immigration system,”

After revealing the reasons, the official could not describe a specific example of a past national security threat that arose as a result of “birth tourism.”