This from a recent Quinnipiac Poll, as reported here. Excerpts:
Forty-three percent of voters support building the border wall, while 54% oppose it, according to the national survey of 1,147 voters, conducted Dec. 12-17, 2018.
The record 43% support represents a five-point jump from its August 15, 2018 level of 38% and is up seven points from its year-ago level of 36% (Dec. 13, 2017). Back on April 20, 2017, only 33% of voters nationwide supported building a border wall.
By party affiliation, Republicans overwhelmingly support building the wall, Democrats overwhelmingly oppose it, and Independents are divided:
Republican Support: 86%
Democrat Opposition: 90%
Independents: 47% Support, 51% Oppose.
If the border wall question were an election, a 54-43% would be considered a landslide, a veritable tsunami of opinion against building it.