Steel mills are seen in Hamilton, Ontario on May 31, 2018, on the eve of tariffs being imposed on the Canadian industry by the Trump administration. (File photo: AFP)

Ottawa on Thursday said it would hit back at US tariffs reimposed on imports of Canadian aluminum with "dollar-for-dollar countermeasures." 

In a statement, Deputy Prime Minister Chrystia Freeland called the US tariffs "unwarranted and unacceptable."

"In response to the American tariffs, Canada intends to swiftly impose dollar-for-dollar countermeasures," she said.