The duties mark a major escalation in trade tensions between the North American neighbours.
US launches fresh strikes on Iran, as Trump warns of retaliation for deaths of soldiers
Iran says it has hit two ships in the Strait of Hormuz as well as targets in Bahrain and Jordan.
Tropical Storm Bertha threatens US Gulf coast
Storm surges up to 4ft are possible along parts of the Louisiana and Mississippi coasts, officials say.
‘Anti-ICE’ Army veteran set fire outside Manhattan federal building, say officials
Andrew Arrabaca, 43, was armed with two axes, a machete, three knives and fireworks, says the FBI.