President Donald Trump threatened on Thursday to deploy the military and close the southern U.S. border if Mexico does not halt a caravan of Central America migrants heading north, raising the risk of huge disruptions to trade.
Stretching almost 2,000 miles (3,200 km), the US-Mexican border is one of the busiest in the world, processing thousands of commuters daily and much of the half a trillion dollars of annual trade between Mexico and the United States.
"I must, in the strongest of terms, ask Mexico to stop this onslaught - and if unable to do so I will call up
