Donald Trump's move on Thursday to push forward his tariffs on steel and aluminum imports has already prompted threats of retaliation.

Why it matters: While the tariffs aren't quite as drastic as originally believed, they're still facing backlash — even at home. Trump's decision met with immediate rebuke from high-profile Republicans and some U.S. manufacturers amid growing concern that a trade war could hurt the economy and risk thousands of jobs.

What they're saying: