Why Section 301 probes matter — and what they mean for Trump’s tariffs
President Donald Trump speaks to supporters during a rally at the US Steel-Irvin Works on May 30, 2025 in West Mifflin, Pennsylvania. Jeff Swensen | Getty Images Here’s CNBC’s brief guide to Section 301s — what they are, why the White House has resorted to using them, and what President Donald Trump’s administration hopes to …