Sir: There is contentious tussle between US and Mexico over border wall construction. The Trump has been trying to build a border wall in order to stop or prevent human trafficking, supply of drugs and smuggling. Pakistan and Afghanistan are facing the same problems. Smuggling is a very common practice and this smuggling affecting our economy. If Pakistan able to stop this smuggling, it can prevent illegal supply of arms and drugs can also be stopped. KHALIL AHMED SHAR Islamabad Published in Daily Times, February 13th 2019.