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Detroit News Columnist Daniel Howes and Michigan Radio are partners in weekly essays examining what's hot in Michigan business and politics – and what it all means. This week, Howes says President Donald Trump’s 25-percent tariff on foreign steel and 10-percent tariff on foreign aluminum threatens to undercut economic growth, spark an escalating trade war and harm some of the manufacturers he professes to want to help. And the scramble inside the White House to deliver details on the tweeted trade policy doesn’t instill confidence in business leaders or foreign capitals.

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