US steel companies capitalise on Trump's fresh tariff threat
** U.S. steel companies gain in premarket trade ** On Friday, Trump said he would raise tariffs on steel and aluminium imports to 50% from 25%, effective Wednesday, sparking widespread criticism from trade partners ** Cleveland Cliffs CLF.N jumps more than 26%; Nucor NUE.N gains 8.9%; Steel Dynamics STLD.O soars 11.3% ** Century Aluminum CENX.O climbed 12%, while Alcoa AA.N rose marginally (Reporting by Purvi Agarwal in Bengaluru) ((Purvi.Agarwal@thomsonreuters.com))