They are speed bumps. They are not structures you can just leave unattended and expect it to function.
You still need border patrol constantly checking them, tracking the people around the area, and searching for holes and tunnels.
It's a complex situation that needs studying and serious investigation of it's going to be usefully improved and ensure money well spent.
That can't happen at the end of a gun, or when one side lies and acts in bad faith.
Open the gov, get a bipartisan group together to work on it, and get Trump and his stupid ideas out of way.