The court is considering two lawsuits filed by small businesses along with a third pressed by state attorneys general. All three lower courts declared the tariffs to be unlawful. Photo by Kevin Dietsch/Getty Images/Postmedia files

Key United States Supreme Court justices expressed skepticism about the legality of president Donald Trump’s sweeping global tariffs , in case that could undercut his signature economic policy .

Hearing arguments in Washington Wednesday, three conservative justices questioned Trump’s use of an emergency-powers law to collect tens of billions of dollars in tariffs a month.

Chief Justice John Roberts said the tariffs were an “ imposition of taxes on Americans and that has always been the core power of Congress.” Trump-appointed Justices Neil Gorsuch

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