"You need to build a wall around the Sahara", Trump said, according to Borrell.
"The border with the Sahara can't be longer than ours is with Mexico", the United States president is said to have declared, referring to the ease with which Spain can build the suggested wall. Trump disagreed, according to Borrell's recollection, adding that "the Sahara border can't be bigger than our border with Mexico".
When asked for more details on Borrell's comments, a spokesperson for the foreign ministry told The Guardian, "We can confirm that's what the minister said, but we won't be making any further comment on the minister's remarks".
The White House did not immediately respond to ABC News request for comment.
Killed After Syria Accidentally Shoots Down Russian Military Plane
A recovery operation in the Mediterranean Sea is underway, Konashenkov said. Israel has refrained from taking sides in the Syrian civil war.
The length of the US-Mexico border is less than 2,000 miles compared to the Sahara that runs for around 3,000 miles.
The report shows Spain as the leading destination for migration in 2018.
It would be similar to Trump's planned wall across the US-Mexico border to stop illegal immigration.
The plan has been complicated by funding disputes, complex property transactions and the opposition of Democrats in Congress. Mexico has refused to pay for it.
Spain has two enclaves - the cities of Ceuta and Melilla - on the North African coast. According to Europa Press, Borrell stated that Europe can not absorb as many people as there are trying to come, "especially if they are Muslims", without compromising its cultural identity. They have become magnets for African migrants seeking a better life in Europe and refugees fleeing persecution and conflict. Altogether, around 77,500 migrants have reached Europe by sea illegally so far this year, according to the IMO.