"national border" is a correct and usable phrase in written English.
For example, "The US government is planning to strengthen security measures along its national border with Mexico."
Germany, too, has re-established national border controls.
We have, for example, proposed a national border police force.
Sahara Impasse: Line in Sand or National Border?
Our thinking about these questions did not end at the U.S. national border.
Without that, the resurgence of national border controls is almost inevitable.
As such, the need for national border controls has become a self-fulfilling prophecy.
Centrist parties in Germany, Austria, Belgium and the Netherlands have all tried to appease the far right by threatening to re-erect national border controls.
Though we are closing the Program, we are excited about the new bi-national border program, Border 2020, which was developed through extensive public input and participation.
Four are dead, including the two leaders of the bi-national border flood control agency.
The research was part of a bi-national Border Malaria Project launched in 2008 investigating cross-border malaria transmission between Ratanakiri Cambodiaandand Gia Lai (Vietnam) provinces.
National Border Patrol Council President Brandon Judd then stepped up to the microphone, defending Trump's plan for a border wall.
