"has it dawned on any one yet that this idiot is stark raving mad."
Because he wants to enforce existing law?
Has it ever occurred to you that the way we currently handle immigration and illegal aliens is sheer lunacy? Sanctuary cities, catch-and-release, welcoming Syrian refugees, government assistance (including welfare, education, healthcare, and food stamps) to illegals, and voting rights.
Illegals cost us $100 billion per year -- money we don't have. You want to keep them and add more? Who's stark raving mad?
No, because he thinks the national interest is served by repeating stupid ideas. It is not stupid to propose a wall, a wall of sorts is already being constructed, but to suggest he can arbitrarily demand and enforce his will on another sovereign nation. It is stupid to suggest that the citizens of another nation are all criminals, drug dealers and rapists. It is stupid to conduct talks with a leader of another nation when all you are going to do afterward is antagonise the citizens of that nation.
There is no political capital in enforcing existing laws, but he sees political capital in making radical pronouncements
You are aware that 10 years ago Congress passed the Secure Fence Act, authorizing the funds to build a wall on our southern border, aren't you? But, as with many of our other laws, it's not being enforced.
Mexico has done nothing to stop the illegals from crossing. Actually, they've encouraged and assisted that activity.