President Trump is planning to declare a new national emergency in order to implement sweeping tariffs on Mexico over the flow of Central American migrants to the U.S., according to a draft document of the declaration reviewed by The Hill.

According to the document, the new emergency is necessary due to “the failure of the Government of Mexico to take effective action to reduce the mass migration of aliens illegally crossing into the United States through Mexico.”

The new emergency declaration would follow a February emergency declaration, which Trump used to justify sending National Guard troops to support Customs and Border Protection (CBP) officials at the southern border.