United States President Donald Trump's proposed 50% tariff on copper imports would affect Mexican exports worth around US $1 billion per year.

Trump says he will announce 50% copper tariffs Chile, Mexico ship their copper largely to China Governments awaiting clarity on US measures Copper exporters prepared to seek new markets SANTIAGO/MEXICO CITY,

The U.S. has closed its southern border again to livestock imports, saying a flesh-eating parasite has moved further north in Mexico than previously reported.

The flesh-eating livestock pest New World screwworm has advanced closer to the U.S. border with Mexico, the U.S. Department of Agriculture said, prompting Washington to block imports of Mexican cattle just days after it allowed them to resume at a port of entry in Arizona.