The Constitution requires the President to “take care that Laws be faithfully executed,” but it does not say how that is to be done nor is there one word about Executive Orders in the Constitution.  Government agencies have issued thousands of rules and regulations governing just about everything we do and have been doing it without Executive Orders from the president, so why was it necessary for Trump to issue his immigration Executive Order to accomplish the objectives contained therein? It seems to me it could have been done simply by Trump meeting with the Secretaries of Homeland Security and State Department and telling them what he wanted. The Secretaries could then have quietly issued rules and regulations to temporarily suspend the issuance of visas from certain countries, suspend the refugee program and improve the vetting process.  It may not have prevented legal challenges, but there would not been a hard copy EO for judges to interpret or misinterpret.