I was listening to a call in show on CSPAN about an hour ago, there were not a lot of call showing love for the democrats. Independents didn't understand what the democrat problem was with security, and even some democrat callers are getting ticked off being branded the anti-security party. Trump shouldn't cave, he has overwhelming support. Democrats are nuts for stumping on an anti-security agenda. It is like shooting yourself in the foot with a bazooka.
Call in shows mean nothing. Even Limbaugh doesn't claim that the calls he takes are representative of public opinion. I doubt that many people listened and they do not support a wall.