The president can secure the borders under the authority granted him in the constitution.
The president can round up and deport all illegal immigrants and non-citizen undesireables under existing federal laws.
The president can restrict immigration under existing federal laws.
The president can direct the development of a civil defense plan under existing federal laws.
The president has sufficient powers available to him to provide protection to the american people without asking for help from the congress or the courts. The fact that he has taken no action in these matters defies logic.