U.S. steelmaker shares soared on news of President Trump’s new tariffs. But are these tariffs as bulletproof as investors seem to believe? The steel tariffs, like those on autos and auto parts, are sector-based.

President Donald Trump's steepest tariffs fell into legal limbo this week, casting uncertainty over a major swath of the president's signature economic policy. The Trump administration could ultimately prevail in a court battle over the levies or seek other legal authorities to reimpose some of the tariffs,