One of Donald Trump's big campaign promises was to get America making and exporting stuff again. To that end, he's leading by example by suggesting the Spanish government import his 'build the wall' policy to keep out unwanted immigrants.

Josep Borrell, the Spanish Foreign Minister and former President of the European Parliament, says that Trump told Spain to deal with the migration crisis in the Mediterranean by building a huge wall, much like his mooted "big, beautiful wall" along the Mexican border. It's broadly assumed Trump made the pitch while visiting Madrid in June.

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Borrell also said that when met with scepticism as to the practicality of the plan, Trump said that, "The Sahara border can’t be bigger than our border with Mexico." At 3,000 miles long, the Sahara border is roughly 1,000 miles longer than the United States-Mexico border.

Were it to take Trump's advice, Spain would have the added difficulty of having to build across several other countries if they wanted to close the 2,950-mile gaps either side of their two autonomous cities on the north African coast, Melilla and Ceuta.

What with former allies Michael Cohen and now Paul Manafort flipping to help the Mueller investigation, and the ongoing row over Supreme Court candidate Brett Kavanaugh allegedly sexual assaulting a girl while he was a teenager, Trump's own wall hasn't been part of the political conversation in America much lately. It's still happening, though.

However, Newsweek reports that the prototype walls currently being tested aren't exactly the impenetrable defence Trump had sold it as. US Customs and Border Patrol reports show that teams have been able to breach the $20 million prototype wall on several occasions, and in one test managed to make it unstable to the point of collapse.

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