Absolutely. From this day forward I would treat any person claiming asylum from this hemisphere as a spy or advance force and any smuggler, aider or abetter, trafficker or otherwise as enemies. Deny them entry at the border for false claims. He needs to issue an EO advising that no further asylum requests from Canada, Mexico, Central America or South America will be entertained or considered by the United States and requests for entry for such will be denied at the border. Post signs at all of these crossings that say "NO ASYLUM HERE".