A counter-protest would be quickly labeled "racist" and "discriminatory". We have to be "diverse".
I like my idea.
Mark the border. 50 yards on the US side of the border, put up a 20 foot, prison-style chain link fence, razor wire and all. In 150 yard increments along this fence, on the US side of the fence, are towers with two armed border patrol agents. The 50 yards between the "actual border" and the "new border" will be known as the Shoot Zone", because thats what should happen when someone is within that area.
Each tower is equipped with communications equipment, two shotguns, two semi-auto carbines, and one scoped rifle with ammo for each. The agents would also have their issued sidearms. The towers would be manned 24 hours a day, 7 days a week, 365 days a year.