(Bloomberg) -- US President Donald Trump suggested building a wall across the Sahara as a means to help solve the European migration crisis, Spain’s Foreign Minister Josep Borrell said.

“Closing the ports is not a solution, as neither is it a solution to build a wall across the Sahara, as President Trump suggested to me recently,” Borrell said at a lunch in Madrid on Tuesday.

Increased numbers of migrants from Africa have been arriving on Spain’s shores this year as Europe struggles to come up with a common strategy for dealing with their plight. Spain has two enclaves -- the cities of Ceuta and Melilla -- on the North African coast.