The wall should ideally be 30-feet high and the side facing the US side should be “aesthetically pleasing in colour”, the department said.
It is unusual for a sitting president to attack a member of the judiciary, which the US constitution designates as a check on the power of the executive branch and Congress.
Apart from stopping newcomers from seven countries entering US for the next 90 days, the ban will more severely extend to people who already live in the US under visas and green cards.
The US department of homeland security halted refugee resettlement interviews in anticipation of the likely changes in refugee policies under Donald Trump.
Immigration and Customs Enforcement has told field offices nationwide to launch a 30-day “surge” of arrests focused on mothers and children who have already been told to leave the US.