We citizens elected a New President; new to Washington, new ideas, new methods. His leading issue that generated a large portion of his support was, "Build The Wall."
Now, two years into Trump's term is seem apparent that many Members of Congress, for a variety of reasons, will not support his call to action. Most of us already know the Schumer/Pelosi cabal ideas to simply obstruct anything and everything Trump proposes. Other moderate Democrats in the House simply follow their lead out of fear of losing their spot on a Committee or ridicule.
The real question is why do so many Conservative Republicans who were elected by voters who also voted for Trump, refuse to get in step with Trump and their constituents.