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One of Donald Trump's key election pledges is the building of a wall along the US/Mexican border - to keep the immigrants out, and to be paid for by Mexico.

The border is two thousand miles long - and the six hundred and seventy mile stretch built by the Bush administration cost 2.4 billion dollars. So pro-rata the Mexicans would have to pay about seven billion dollars. What are the chances of that?

Jim Naughtie sent his views on the issue from California for Broadcasting House.

(Photo: James Naughtie. Credit: 麻豆官网首页入口)