Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Canada Strikes Back at US over Tariffs, Unveils Aid Package by Reuters Canada struck back at U.S. steel and aluminum tariffs on Friday, vowing to impose punitive measures on C$16.6 billion ($12.63 billion) of American goods and unveiling a C$2 billion aid package for affected industries and workers. Foreign Minister Chrystia Freeland told a news conference the tariffs would come into effect on July 1.