Covered!
Once the "protesters" approach the fence, USSS will jam all phone signals and the "protesters" will stumble about dazzed an confused staring at blank iphones.
This is Tippy Top Super Secret so don't tell.
Flat bed trucks with bulk packages of toilet paper
signs stating "Free Toilet Paper - While Supply Lasts"
Drive trucks away from the White House (toward city government offices)
Protesters will see signs and chase after trucks