Question: Which structure currently operates as a "virtual fence:"  Boarder Wall or Mexico-United States Barrier?
Sentence (from "Day Without Immigrants 2017"): Day Without Immigrants (or A Day Without Immigrants) was a protest and boycott that took place on February 16, 2017, to demonstrate the importance of immigration, and to protest President Donald Trump's plans to build a border wall and to potentially deport millions of illegal immigrants.
Relevant evidence: Yes