President Donald Trump's plan to slap taxes on steel and aluminum imports was branded Friday as "absolutely unacceptable" by some, including Prime Minister Justin Trudeau of Canada, the United States' biggest foreign source of both metals. Trump hasn't sparked a trade war, yet. But his provocative action has raised the risk of an all-out conflict that could pit the United States against its friends and the entire global financial system that it helped create after World War II. (AP)