When Trump was closing down the government, the major opposed Trump's wall, which at the time was viewed to be a concrete wall from the Gulf to the shining sea. The Democrats wanted any fence to be called a wall. Trump has taken the same position.
I don't think that the majority of voters oppose building additional border fence. after all Congress approved $1.4B for that purpose for 55 of fencing, at their choice of location and construction. Trump wants 180 more miles.
I don't see a nationwide groundswell to tear the wall down. Politically, this would certainly look like "open borders", not what the Democrats want to stand for, even though this is exactly what may be reasonable in El Paso and San Diego. What the border mayors seem to want is lots more security (in person and electronic) at the legal border, and perhaps an additional legal border crossing or two (which wold cost a lot of money).
The REAL ISSUE, and there is one, is that there are millions suffering in Central America and parts of Mexico. These folks want asylum in the US. Should we accept asylum seekers without limit? Should we spend billions to help Mexico and Central American governments deal with the underlying issues of poverty and gangs? The caravans of people will come, if Mexico doesn't stop them. There are indeed millions who want to come.
Another REAL ISSUE is what to do with regard to immigration as a whole. What do want done for the DACA folk and those here on temporary emergency stays (some her for 10 years from Haiti, which is still an emergency situation)? What do we want done with the 10 or 20 million illegals in the country, mostly working at low shilled Jobs? What do we want about the system of legal immigration (there are many options?
There is a national consensus. The Democrats COULD have positions consistent with them in 2020, or not.
Ok. So you did’t mean it would literally disqualify him.
Considering most Americans are opposed to the wall, I don’t see how his statement guarantees a Republican victory. It’s not like he needs to conceived any republicans, the dems just need to make sure that ppl vote.