Well in Obama's case it was particularly difficult as you had/have a large portion of democratic areas and politicians who lean on the pro oil/energy side and oppose regulations due to how they would affect the area that they serve (such as Louisiana or West Virginia where most democrats lean anti regulation)...
Except by dismantling the EPA he's kind of screwing over future generations (don't try and tell me coal is a clean resource)
The wall is going to cost tens and possibly hundreds of billions of dollars. There's no way they'll recoup that from Mexico.
Trump: Mexico is a poor crappy place
