US President DonaldTrump announces he’s signed letters to 12 countries detailing proposed U.S. tariffs on their exports. FacebookTwitterPinterestWhatsAppEmailPrint US President DonaldTrump announces he’s signed letters to 12 countries detailing proposed U.S. tariffs on their exports. Described as “take it or leave it” offers, some tariffs could go as high as 70% and may take effect from August 1.